IDK about every use case, but slightly older generations of CPUs would affect me roughly zero. I'm sure there are things so compute-intensive that one would care very much, but a lot of people probably wouldn't bat an eye about that, and not because they're unsavvy.

To the extent that these things are supported as a whole by the vendor rather than a bunch of finger pointing though, that could be massive, specifically in terms of how many staff members you could "not hire" compared to if you had to employ someone to both build and continually maintain it.

I'm posting this not to invalidate what you're saying, just to say that a little predictable upfront amount of money (the premium) will be spent very happily by lots of people who value predictability and TCO over initial price.