My comments below are oriented towards a solo trip, not one for two or more people.
I brought a 7 inch tablet or a small computer on some trips, but for the past decade have only brought my Android phone. Screen size is 5.5 inches. My foreign trips, I planned on getting a sim card for local internet, but in both cases did not get one, thus my phone was a wifi device only. But it was adequate for that. The trip I am planning now, my USA based cell phone company charges an extra $10 per month for international plan, I plan to pay the extra $20 so my phone works there.
Never even thought of bringing two pumps, until my upcoming tour I am planning now. I store my pump on my frame, and my next tour that I am planning will be in a lot more urban areas than my past trips. I have a very tiny emergency use only pump (90 grams, about 25cm long) that I might bring in case I come out of a grocery store and find my good pump is no longer attached to my frame. Urban areas are where I think a pump theft may be more likely.
On a tour, only once have I actually needed my spare tube. But, I still always carry two because sometimes a tube will fail in a way that can't be patched and then I would still have one. If that happened, I would pick up another tube at the next bike shop.
That said, I carry a pretty complete tools and spares bag. I have had to use my cassette lock ring tool on a tour. Carry spare spokes. I sleep better knowing that my heavy tool bag is with me. I also sometimes carry a spare tire, sometimes not. If I am using 26 inch tires, I most certainly carry one, but 700c selection at bike shops is pretty good. If I carry a spare tire, it is a light weight folding one that is not intended to do thousands of miles, it is intended to get me to the next bike shop. That said, I might carry a better long distance spare tire on my next tour, one of my tires is already quite well used and the planned tour is a thousand miles, so the probability that I may need to replace it is high enough that I would rather carry a tire capable of being a replacement and not just an emergency spare.
I usually carry a very complete multi-tool (Crank Brothers, 17 tools). But I also carry a tiny one that is so small I do not notice it is there in my pocket, the big multitool is in the tools bag in the bottom of a pannier. Otherwise I try to minimize redundancies.
If I bring my S&S coupled bike, that takes a lot of time to unpack and assemble, and later disassemble and pack. I bring more shop sized tools for that to same time. But in that case I do not install the dyno powered lights, instead only use battery lights and only use the dynohub for battery charging. I have almost never needed a headlight on a tour, thus a small one that straps to the handlebar with an elastic is more than adequate if I need one.
My tours are multi-week, I bring stuff accordingly. If I was going to use only minimalist bikepacking gear, I could not carry more than a few days of food, would have trouble packing even my tiny one person tent with sleeping bag. I would be doing a trip measured in days, not weeks.
Clothing, I usually bring two sets of on bike clothing and two sets of off-bike clothing, intended for the weather extremes I may be exposed to.
One pair of bike shoes, one pair of hiking shoes for off bike, and one pair of light weight thin sandals. Pedals allow the hiking shoes to be used on one side, SPD cleats on the other side. There have been days when I biked in the hiking shoes (stiff enough for biking) instead of my bike shoes. Bike shoes might be really wet. Or, the terrain might be so rough that I do not want to be clipped into my pedals.
Without food, I can usually do all of this in a pair of Ortlieb Front Rollers, a pair of Ortlieb Back Rollers, and a large handlebar bag. That is no more than 70 to 75 liters of stuff, excluding food. I also carry a dry bag on top of the rear panniers for more volume, as sometimes I had to carry weeks of food. But without food, if I can't do it all in four panniers and a handlebar bag, I try to reduce stuff so that it will all fit.
Camping, I am not a minimalist, usually use a two person tent. But there are extreme minimalist bikers out there that use a bivy sack instead of a tent, no cooking gear, only eat stuff that does not need cooking, etc. I would rather enjoy a trip than to be one of those minimalists that seem to thrive on deprivation.
I really think about the likelyhood that I will use something often before I bring it. But I also think about the trouble I would be in if I do not have what I need to fix something. It is a balancing act. Since I built up all my touring bikes from parts, I know what is needed to fix them. But somethings, I feel no need to bring, like a bottom bracket wrench.
My Rohloff bike, I still am using threaded sprockets. I carry the sprocket removal tool, that was stressed in somewhere on the Thorn website as something to bring. And the odds of a bike shop having that is minimal. But if I needed to actually use that tool, I would probably be at a bike shop and they have chain wrenches, so I would not carry one. I describe this in this much detail because it explains my thinking, something that even a bike shop might not carry, maybe I should carry it in case my hub needed work.
I usually use a liquid fuel stove on my trips that do not involve flying, a butane stove on trips where I fly. But my next planned trip has no flying and I am leaning towards butane for that. It is hard to find liquid fuel stove fuel in quantities less than a gallon in North America and I do not want to carry a gallon of fuel. Since butane stoves are so tiny, I plan to bring two, one sits very low and it is easier for my short windscreen to work well. The other is more convenient to use in the morning for fast coffee. I also plan to be able to use both types of butane canisters, the nozzle or bayonet type and the threaded mountaineering type ones. But will not need the French non-threaded type ones. I find that stores in North America are more frequently selling the nozzle or bayonet type canisters.
I planned to quick write out a short note, but I completely failed in that. Sorry for the long read.
My comments on butane canisters might be confusing here, so I attached a photo. On the left is what I refer to as the French type, the canister is not threaded, next one to the right is a puncture type canister that is becoming nearly impossible to find in North America. The green one is the one I consider to be a threaded mountaineering type one. And the one on the far right is rapidly becoming popular to use in North America on larger stoves. My next tour, I plan to be ready to use either of the two on the right, but not the two on the left. The one on the right is missing the red plastic cap on top, it has to be carried with that plastic cap, otherwise if the top nozzle is depressed in your bag, butane can come out. When I took the photo, I did not notice the cap was missing, I took this photo at a time when I was testing stoves and had not yet put the cap back on.