I hadn't thought of that. Microsoft were forced to include a "Browser choice" shortcut for European copies of Windows. It was deemed unfair from a market standpoint for them to include Internet Explorer in Windows without any mention of other browser competitors. So would you say that this Xbox app is a competitor to Steam for example?
Maybe i'm missing more information, but they really think it's illegal that Microsoft packages it's own browser in it's OS? That sounds odd. Almost like villainizing Google for not allowing another browser on ChromeOS.
Anyway, a new Xbox App would be neat on Windows 10. Their current integration isn't really that great, and I would guess that Xbox One having a more robust system probably allowed them to have the room for this on the new OS.
The European powers-that-be basically thought that Microsoft was monopolising the browser market by including IE in the Windows install. They also thought that this gave Microsoft an unfair advantage over their competitors. Not everyone who uses a PC is tech savvy and will just use whatever they are presented with without shopping around. I kind of understand where they are coming from but it's a complicated subject when you start digging.