I'm not arguing that. My argument is actually because cars are far more reliable, doesn't that decrease their resale value as more and more modern convinces are added to newer cars?

You've got a window of less than ten years on a modern car where then the technology in it is so old that few people would consider purchasing it to keep it for another five - ten years.

For example, my mom just bought a '24 Subaru with a huge touch screen in it. Will it keep working in ten years? Probably. Will anyone want to buy that phone on wheels in ten years? Not likely. I just bought a 2013 Mini Cooper. It "has bluetooth" but it's strictly for (shitty sounding) phone calls and not audio streaming. I'm one of few people who's okay with this because I'll only drive 1500 miles a year.

Whereas a 25 year old car in 1998 was, aside from your accurate claim about reliability, perfectly fine as a daily driver. If you can find one and are capable of proper maintenance, you could still drive a 1960s car today. But because modern consumer tastes expect advancements in vehicles the same as they expect them in phones, I just don't see used cars living as long as older cars have.

So, it's not so much about the ability for a vehicle to remain on the road but consumer choice.