Syncing an Xbox account will also add any supported titles a member has access to via PC Game Pass
So instead of paying a Game Pass subscription and using Microsoft's app/website to stream our games, we can now pay a Game Pass and GeForce Now subscription and use Nvidia's app/website to stream our games..?
Yes I know, I know, in this case we'd be streaming the PC versions of these games and not the console versions, but is it worth it, really? There are extensions for Xbox Game Pass that allow you to use M+KB, if that's what you're looking for. I'd give this a try before subscribing to yet another service. I reckon there aren't a ton of games exclusive to PC Game Pass, right?