I built up a new bike from the frame this past spring from a (non-Thorn) Titanium frame that did not have a fork included. The frame was disc only, so I obviously had to put a disc on the back. For the front, instead of buying the recommended fork for $300 USD I planned to use a fork that I already owned that was a rim brake only type of fork.
The result is a touring bike that is V brake front, disc rear. I find that the rim brake on front outperforms the rear disc when I really have to rapidly decelerate, but if it is just slowing down slightly the two brakes are comparable. Am using Koolstop Salmon pads on front with a non-CSS rim, the rear brake is a TRP Spyre with stock pads, stock rotor, and compression-less cable housing. But, in the wet (rain) I find that I prefer the disc over the rim brake.
Before you tell my that I am judging my brakes wrong because the front is always better, I find it hard to apply enough disc brake to make the rear wheel lockup and skid. I did run in the rear disc brake when new in accordance with the manufacturers recommendations.
Regarding wearing out rims, I am quite pleased with the CSS impregnation on the rims on my Nomad. The braking is less effective than when new, about the same as most non-CSS rims I use. But if my CSS rims get to the point that others have complained about with limited stopping capability, instead of following the instructions to only use CSS pads, I will switch to softer pads to see if that resolves the issue.