This is a lot less exciting than it seems to be at first glance. Opening apps from my phone on desktop: yes, I can see utility at that. But opening standalone phone app installations on my desktop? Why? There is almost no phone app I can think of that doesn't have a much better desktop equivalent - save, maybe, for games, but this doesn't seem to be aimed for that.

Since app developers need to make extra effort here to make it work (repackaging, maintaining store presence) and the experience is definitely worse, I don't see why big brands would do so. Microsoft should instead aim for improved general Android integration, like what they did for Samsung phones.