Well then, maybe you have to live with some inconveniences and higher costs than you would like, because of the natural market dynamics?
You pointed out all those factors to say that they're reasons why CPU OEMs should be able to make all your dreams about price, quality, speed, open hardware come true?
It was about the market being difficult to enter. If you disagree, prove me: I hereby pledge to buy one CPU (needs to be a custom design) + mainboard designed and manufactured by supernova87a, and am willing to pay 800 US$, due 3m after delivery, conditional: It runs my Linux &Windows software like a, and performs at least equally or better than a, then-new system costing up to 400US$ (for cpu+mb, so today something like a Ryzen 1600). This agreement expires on 1.1.2025 0:00 UTC. Your call, do you agree? - Edit, also for balancing reasons: What do I get from you if you fail?
(Since I know you're not getting a x86 license that's an easy call for me - I know for sure you're unable to tap into that market)
You're right, but: In the unlikely case a random person on the internet succeeds (who knows what happens in the next 5 years, or who s/he is?), I am out of 800US$. For something that I think is a good idea. In case of 800m US$, well, I'm a little bit embarrassed to admit that I can't afford that right now ;-)
You pointed out all those factors to say that they're reasons why CPU OEMs should be able to make all your dreams about price, quality, speed, open hardware come true?