I would love the child of a Surfacebook with a Framework laptop; or A bare keyboard attached to a screen, that I could plug my phone (possibly running Phosh) and use it as a hardware for a laptop experience
Agreed, sadly not a technical problem but a business one. Unless governments step it I don’t see this changing.
It will eventually but of course it depends what is really meant by “high end”.
As the decades roll by I find I care less and less about “high end” and more and more about avoiding bullshit. While presently the portion of people who would buy such a phone is too few to make manufacturing viable, I suspect that portion will grow in the coming decades as millennials get older.