Evan ProdromouOthers were quick to say that they only use social features with real friends and family. I'm not sure why that would be a "but..."; it's the whole point of those features.
Evan ProdromouFinally, I think Fediverse users are generally more protective of their privacy than the general population.
Evan ProdromouAnyway, my answer: yes. I have a profile on XBox, Switch, and Google Play Games. I connect with friends on all the platforms. I share achievements and activities and screenshots and sometimes chat.
Evan ProdromouIn my book "ActivityPub: Programming for the Social Web", I talk about federating gaming platforms. I think you should be able to connect to an account on Steam from your XBox (or Mastodon) account. Add them to your friends list, and follow their activities.