My non EV is at 250k miles at 16 years old on original Trans and Engine and has no mechanical issues whatsoever. Yes, this is not "common" for 15+ year old cars to survive and still do well, but go hop on marketplace and look at cars under $5000. All the undamaged still running vehicles are over 15 years old, and there are literally thousands for sale at any given time. If we were in a completely/mostly EV country there would be no cars that still ran or were worth buying that are over 15 years old.
Also, the battery fixing videos for 1/3 the cost isn't really "fixing". It's just replacing the completely ruined cells while all the rest are on their last leg.