Europe built sovereign clouds to escape US control. Then forgot about the processors
(www.theregister.com)
1980s tech CPU
So it can already run Wolfenstein and Linux...
The story of the modern PC is about hobbyist, in my opinion. It was a bunch of tech guys slapping things together, figuring it out as they went and cowboy stuff like writing specifications on the plane on the way to a conference. I understand what you're saying about the limitations around design and production... but these things aren't impossible just difficult.
Maybe a new discovery in physics or transistor manufacturing will be the key to this new era. Or a bunch of things like that adding up over time until one weirdo figures it out and changes the world.