It's honestly been a long time coming, especially since MS largely ignored PC gaming for years, and instead put their focus on just their console side a lot more over the years. They need to do a lot to earn back that PC market and I'd actually like to see them put in 110% of the effort to do it.
That all makes sense, but why makes these games solely for PC?
The argument I always see if that forcing a console version will "dumb down" the games (which I sorta agree for AoE, but Xcom proves Turn based tactical games can work on console), but either way, now that Xbox has kb/m support, they now have zero excuses.
Bet with Intrinsic:
The Switch will outsell 3DS (based on VGchartz numbers), according to me, while Intrinsic thinks the opposite will hold true. One month avatar control for the loser's avatar.