With electronic, there's really nothing to fix other than the eventual replacement of the RD jockey pulleys, just like with mechanical. If a component quits working, there's little choice but to buy a new part, which is pretty much the case with mechanical. With SRAM, it's easy to carry a spare battery for the derailleurs. Some might also choose to carry extra coin batteries for the shift levers, but those usually last at least a year, so annual changing is good idea. It won't be too long before only the low level component groups are mechanical. Campy will be the last hold out since they were first with 12 speed, but still only have one level of electronic that costs more than most people want to spend.

Same goes for rim brakes. They're disappearing fast. I got rid of mine over 2 years ago.