I have no idea why you'd willingly use a Surface with Linux (let alone call it a solid Linux tablet) given all these problems, but I have a Dell Latitude 5290 2

I have no idea why you'd willingly use a Surface with Linux (let alone call it a solid Linux tablet) given all these problems, but I have a Dell Latitude 5290 2-in-1 (available for under $300 as off-lease refurb depending on specs) which fixes almost all of these. The only real issue is the camera which does not work for similar reasons, but I don't find that to be a big loss because I have a phone with a far better camera on me at all times.