Phil Spencer said that on his last interview: "Xbox ecosystem is xbox console, pc and cloud. "
Do not confuse historically multiplatform games; they have never been exclusive games. There is no reason for Doom or Black Ops to become exclusive, especially since MS has committed to keeping Call of Duty multiplatform for istance.
This strategy suits me very well, especially with the democratization of play anywhere possible only within the Xbox ecosystem, ( Xbox consoles, PC, and cloud). For now, it is not sufficiently in place, but it is a real plus to buy a game and have it available 'everywhere,' well, almost everywhere.
I don't know why writers tend to focus on 'I'm sure members of the console-centric Xbox audience may feel inclined to roll their eyes'? It's a very small minority of people. When you go on forums, Reddit, and others, the majority is much more open than that.
But, because there is a but, there is still a desire to maintain an Xbox identity, to keep the big franchises within the Xbox ecosystem and not elsewhere. And I am one of those people, not to keep games only for myself and not want to share them, but simply for the long-term health of Xbox. But that's not the subject here. Xbox ecosystem = Xbox console, PC, and cloud !