From Microsoft's perspective, releasing something like MCC as an exclusive title is done to get people to buy into the Xbox ecosystem.
Sell people on the console initially with MCC, Sunset Overdrive, or any other exclusive title, then they are purchasing Xbox Live, some downloadable games, and more AAA titles. Microsoft is collecting money at every turn.
PC gamers likely aren't a great demographic from that context. If we do buy a PS4 or XBO, we likely are only buying a couple games a year, not buying Live or PS+, and not buying any multiplatform games.
From our perspective those are bad values, paying higher prices for objectively worse performance, and no forwards compatibility.
Developing and releasing games such as MCC or The Order are very expensive, Microsoft or Sony may not even be looking to make a profit up front with these releases, theoretically they will be making more profit on the back end. This was also the reasoning behind pushing the console as a loss leader in prior generations.
Just pointing out their perspective as to why something like MCC likely won't be coming to PC.