If Microsoft is gonna develop all their games and run them like apps on the Windows Store, it's gonna be a shitshow.
Look at the release of Gears of War Ultimate Edition for PC. Performance issues galore. Part of it is trying to port a DX9 game onto DX12 while working with UE3, which I've heard doesn't play nice in that regard. But the borderless fullscreen lock, V-Sync lock, and other configuration issues are because the game is an "app" and not a regular .exe program. There's no way (that I know of) to access config files that would otherwise fix these issues, and it's gonna suck for games down the line that are made like this.
And I bet it will be most new Microsoft games. They're looking to bond Xbox and PC gaming, look at Forza 6 Apex. I'm sure Gears 4 will see a Windows 10 release, maybe eventually even the Halo series.