Many people aren't old enough to remember the good old days of 10 miles a gallon and annual tune ups cleaning carbs , stuck chokes , clogged fuel filters ,leaky gaskets , am radios and no climate control. Not to mention rotted out exhaust systems on every single vehicle. Not to mention 12 month / 12k warranties.
Most vehicles where considered junk at 100k.
I grew up in a GM shop. No longer associated with the auto biz. Despite all the costs vehicles are much more reliable and require less maintenance and last longer than 40 years ago. If you have a problem its still a PIA but not near as much to do to keep vehicles going well beyond 100k.