The X2 1012 from HP is their surface pro clone and it’s fully serviceable but it doesn’t mean you should still do it ;-). The parts are so ultra tiny now it’s nearly impossible to get things back together.
Yep. Microsoft has learned the lesson Apple learned years ago -- the vast majority of laptop users never upgrade their units, and overall, you're better off with a more reliable unit that won't require repair, than one that is less reliable and is more likely to.
I've been a DIY computer builder since 1975 -- 40 years or so -- but I find myself siding with the "disposable" decision on this item. The reason is simple: I could never build a DIY homebrew machine this thin, light, powerful, and reliable myself; and if the thinness, lightness, power, and reliability were my primary requirements, then the requirement to have it be user-upgradeable/user-repairable is far less important to me.
Of course (as so many FReepers have commented already), YMMV...