"the OS is still terrible"
I find it a stable and reliable OS. There are aspects I don't like (data slurping) which I've tried to minimise.
"Big fat controls to be finger friendly, and I'm not on a touch screen machine so yuck,"
I'm using Win 10 on a desktop and I don't see fat controls, maybe I've spent a bit more time than you have getting it set up how I want it?
"and I bet that this machine will turn out to be fragile compared with a MacBook Pro"
That's just a pissing in the wind comment and it was the one that made me want to reply and downvote you.
"The ability to turn a laptop into a tablet isn't worth the danger of it turning permanently into a tablet because the connector fails"
Do you have evidence of this type of failure?
My Surface Pro 2 is a couple of years old and showing no signs of failure in this regard.