Gears of War 4 and especially Forza Horizon 3 are awesome.
Not only are they great ports (i.e. they run great and look great), they're also awesome games.
Unfortunately, you have to deal w/ the crappy W10 Store/client if you own them on PC.
Unfortunately, dealing w/ the game-files for installs, reinstalls, moving folders, modding, and other things are a royal pain in the ass on the PC for W10 Games/Apps.
Though, if you buy them digitally from Microsoft via W10 Store, you do get both PC Digital Version & XBox Digital Version.
So, worst comes to worst - if you own a X1, you can just play that version.
I would guess if Obsidian joins M$, we'll be stuck w/ their W10 games requiring W10 Store. Bleh.
EDIT:
Also, I'm afraid Obsidian joining M$ could be as bad as say EA buying BioWare. This all....makes me sick to my stomach. We saw what M$ did to Epic Games and Bungie. Those studios might still be alive, but they ain't been the same since M$.