For me, the main advantages of (most) hub gears are low maintenance and very long service life. Disadvantages were limited gear range and less than ideal gear steps, perhaps reduced efficiency (but I am a bit sceptical about that in real-life use). Rohloff solves the gear range and gear steps issue for me. Shimano 8 is good enough for most of my riding, but not quite sufficient for loaded touring in hilly areas.
Chainglider reduces drivetrain maintenance still further, particularly useful when doing survey work on paths and tracks. While doing intensive survey work I used to spend 1 to 2 hours a week on bike maintenance cleaning the bike and replacing chains and sprockets. With hub gear and chainglider this is much less and mainly limited to regular changing of the rim-brake pads.
Before getting a Rohloff, from 1972 to 2012 I used hub gears for somewhere around half my mileage, mainly Sturmey-Archer 5-speed hubs from the 1970's and early 1980's. Hub gears mainly for all weather commuting, other utility rides, local off-road riding. Derailleurs for tours in hilly areas, fun rides in good weather, some commuting in good weather. From 2001 I added Bromptons (hub gears, but with a tensioner, so more like a derailleur for maintenance) which I use when combining bikes with other transport.