Not the OP but I've had this thought as well. Microsoft has an almost unassailable position on desktop even still. If they had a solid position in mobile they could probably expel Android/iOS from enterprise with the same bundling tactics they use to push out different software on Windows with their own (often but not always) inferior offerings. From there the consumer space would be weaker and enterprise may start to ignore iOS/Android altogether. iOS and Android may well be to entrenched at this point for this to be a realistic fear, but based on how aggressively Google reacted to Windows phone (The youtube app fiasco) I think they at least worry about it a great deal.
Ideally, we'd have 3 or more fairly evenly matched and interoperable OS choices on mobile and desktop but that doesn't seem likely to happen. Trapping the monopoly inside it's own castle may be the best we can get.
I feel similarly about people calling for Apple to open iOS up to different browser engines. Idealistically that is what I believe should happen, but realistically I think it would just result in Chrome being even more dominate. For the same reason I lament the death of IE and even the original Edge. I don't personally use IE or Safari but I benefited from them existing and having decent market share.
> Would you rather have an expensive device that you barely control or a cheaper device that spies on you?
It is unclear to me if modern Windows actually still spies on you any less than Google at this point. My feeling is if still does, it isn't by much.