You don't really even see many hybrids on large-scale charity rides, at least in the US. And yeah, quite often people do load up bikes to drive to a ride. I guess for transportation riders this sounds weird, but if you live in location A and the you want to do a group ride at location B that's 20 miles away (not unusual in a big urban area), then I'm not sure what else you'd do.
I'm likely going to a ride out in the southwestern suburbs here in Houston on Saturday, for example. The start is 23 miles from my house, and there's not a great cycling-friendly way to get there, so I'll load up and drive.
I do share your concern about long-term use. We're far enough into the electronic shifting era that early systems are falling out of the support window. Shimano's earliest Di2 systems were only 10-speed, for example; I imagine finding replacement rear derailleurs for that system is nearly impossible now, but OTOH lifespan of a rear derailleur is pretty long.
The version of SRAM's eTap on my bike is 11-speed; it's been updated since, so new bikes come with a 12-speed version called AXS. I don't know if I could easily get a replacement derailleur for mine, but TBH I also wonder that about the mechanical Ultegra derailleur on my other road bike.
