So what seems to stand out against your arguing in my view... even without deep tech arguments that i don't have now(if i ever)... is that is NOT about "devices" anymore but "processores"... yes talk GPU talk processor...
And none of other contender to this spec will be out... matter of fact Intel already has big "physics" cards... Apple neither will be in the shadow... all this things are/will be **fully programmable**.
It is a wonder some news about gaming in Linux... when some of its developers seem to want to keep it 3th class in the sector... boy! it is a luck to have game studios interested...