Microsoft has a usable ecosystem? I think we can pretty much assume that Microsoft, Google and Apple each have a pretty usable ecosystem.
Me, I like my Googles. Not for any other reason than it's what I'm used to, ever since signing up for a Gmail account back in the days of having to be invited to it.
Lack of apps causing more work focus? That's just discipline or lack thereof, depending on the flavour of your device. I could probably switch to Microsoft on mobile, but why would I invest in that when my Android device already plays very nicely with my workflow?
I've just been reading all about how Microsoft are giving us 15GB of OneDrive and competitively priced extra storage (well, 'that same as Google' isn't really 'competitive'). Gee, is Mega.co.nz shutting down or something? Sorry, I'll enjoy my 11GB of DropBox (yes OK, I had to do some things to earn bonus space for free), plus 50GB of Mega, plus 15GB of OneDrive. Fair enough, I do tend to just lump backups of my DropBox and OneDrive storage into Mega (you can never be too safe).
Dare I mention that despite Microsoft selling excellent hardware, if I pick Google/Android, I can choose from several manufacturers, each with their own quirks, benefits and issues? Right now I want a great display to save my eyestrain, so I'm looking to the Samsung Galaxy Tab S 10". I'm also looking for a speedy, lightweight UI on my mobile, so I'm probably going to get either the OnePlus One or an Oppo device.
I'd like to have a Surface Pro 3 though, because my 17" desktop replacement Clevo laptop is not the most portable (but boy does it power through Wolfens... I mean, PowerPoint).
Why do I need a Microsoft device in amongst all my Android fanboyism? In my world, there is still nothing that beats Windows for just getting on with work.