I mean my electric shifting has generally been set and forget same thing with hydraulic disc brakes. No cables to fray or get gummed up or replace. My Di2 system from 2015 still works today and aside from maybe once a year updates in E-Tube (which truthfully I haven't done in over a year or two) and a chain, cassette and pad replacements I haven't really done anything beyond normal cleaning and lubrication. Really it has generally been a hop on and ride bike and never have done anything to the shifting beyond initial set up.

My mechanical bikes in terms of shifting have generally need a touch more work (not by a whole lot mind you but a little more). In terms of braking my hydraulic brakes have been pretty reliable my old daily commuter really didn't need much more than pads and then a rotor once as I was favoring my rear brake a bit too much on the bike but the electronic shifting was flawless and still is.