The tools don't matter, it might be nice, but even though "tons of people prefer the Microsoft environment" I can't recall the last time they produced a product having superior user experience thanks to those tools. I can't name a single website/webapp/desktop app that I enjoy using on a daily base made with visual studio. I know a lot of the game companies use visual studio (c++) to produce parts of their games, but I'm not sure which of the latest games are produced using XNA.

My point is the tools don't matter as much as the strategy and decisions of Microsoft in other parts of the ecosystem to attract talent to produce content for their devices.