I concur, I’m sticking with mechanical. Good availability of 9/10/11 speed bar end shivers for example. I’m just astounded how quickly SRAM moved on from eTap v1. It’s already fairly hard to find parts for that group.

With bike manufactures the real gravy is selling the new bike. Replacement parts sales unlike in the auto industry just don’t see much volume. Most people buy a bike, ride it for a few years then they are pretty much done with it, if they even rode it at all. Most casual riders don’t ride enough miles to wear parts out, unlike cars which typically drive a lot. Absolutely no interest for the bike manufacturers to do much for parts commonality, backwards compatibility, etc.