“Which ones are those? All vehicles I know of seem to last way beyond 100k miles.”
Those with CV transmissions. Plus... Any Chrysler product including Jeep. Any Kia/Hyundai/Genesis. Do I need to mention Ford products? They don’t call it an Exploder for no reason. How about a nice new Mini? Pretty much every Nissan has a shitty CV and they break reliably at around 120k. GMC trucks with a 10 speed. Ford F150 with 5.4L V8.
Have you noticed you can get a nice looking BMW with 90K miles for a few thousand? Same with a Mercedes. Maintenance costs are overwhelming. Heck, it cost me $758 to replace the door actuator on my 2020 Grand Caravan. It was $2500 to replace the AC compressor on my 2015 Camry and the center console screen was $1300 just for the part.
The more complicated the electronics get, the more it costs for simple diagnosis of a problem. Finally, don’t get me started on tiny 4 cylinder motors with turbos.
At least when a slant six needs work, most anybody can fix it without special tools.
I see CV and Jeeps well beyond 100k all the time.