Well geeko/webkit and blink are all financed by the big tech controlling funds. webkit(apple) and blink(google=alphabet) are own and steered by those same ppl.
Oh, and those ppl own and steer microsoft too, and some wonder why those are using blink now. I do ask myself how long they will keep webkit and blink since they have already geeko to feint the anti-trust laws.
But your are right, they made the "Standard" so insanely complex on top of the core noscript/basic (x)html, that it "works" only in their implementations with their armies of devs.
This is accutely toxic for humanity. The only "real" ways out of this: restore noscript/basic (x)html where it is still doing a good enough job, and if a "new" web has to be born: an implemention must be something reasonable in time/skills and efforts for a small team of devs.
Thatcher is by design and I guess Google is mainly to blame by now.