A major point of being a PC gamer is to not play games on consoles. I know that sounds a bit silly and blunt, but it's true. PC gaming has its own culture that goes all the way back to home computers. Console gaming culture developed separately for the most part. Microsoft spent a decade trying to bribe and emotionally blackmail PC gamers into playing games on an Xbox. With a gamepad. And it didn't work, for the most part. PC Halo fans didn't follow the series to Xbox. They just stopped playing Halo. PC Gears of War fans just stopped playing Gears of War.
MS are clearly trying to blur some lines with official support for M+KB on Xbox, and 60fps in their first party games, and stuff like that. Also they've clearly got an interest in trying to make game modding more popular on consoles. Their work with Bethesda is a demonstration of this. The mods available for Fallout 4 and Skyrim pale compared to PC, but they're leagues beyond what you can get on Playstation.
But fundamentally, if you're a PC gamer playing your games with a mouse and keyboard, MS are now trying to cater to you through their first part efforts on Windows. They're also seemingly trying to fix the technical disaster that is the Microsoft Store. They're not gonna try and hold your favorite games hostage in the hope you'll buy a console to play them. "Hey you know how you like playing Halo with a mouse and keyboard? How'd you like to play Halo at drastically reduced resolution and framerate with a dual analogue controller!? Sounds exciting, right!?"
I really want MS to port Rare Replay to Windows, BTW.