I have been playing XIV on Win 10 pro ever since it released, it runs better than on 8.1, which ran better than on 7.
The only issue I have come across is the "doesn't remember user name" bug - it looks like Edge is taking over control of the fields, trying to add autocomplete to them, but the client doesn't show the "pick a username" thingie. (I think it's because of this, since the username field is yellow, just like when you have a remembered password on a browser)