I think the difference is that vehicles used to last 100,000 miles with the best available design and construction. With modern methods they last a long time but could be made to last even longer than they do.
You're right about electronics. They usually last for a very long time and that's good. But when they fail they may be costly to repair, be unrepairable, and be potentially unreplaceable. I'm reminded of the Peter Egan story (in Road and Track) of the car that failed while he and his friends were on a weekend away from home, when 4 experienced foreign car mechanics could not get it running. It needed a new distributor and that was that. And if you couldn't get a new distributor ...
When I was a kid in engineering college I was shocked to find that that people would make something with other than the best available parts (bearings for example), that you could actually design for a certain service life.
How many people taking out a 7 year auto loan intend to keep the car for 7 years? Not many I think.