Why no Xbox?

[era1Ne]

I'm not sure what you mean by this. The linkage is simply for license checking and posting in the PSN ID on your search information it has no impact on whether any other game system can be involved with FFXIV, where do you even come up with that idea from?

Not this again. Of course there is no real technical reason, but still the policies order the publishers to ask wether they are allowed to do crossplay or not. In some cases they are and in some like the chess game i posted earlier they aren't, because if you look at their site today, then you would see no cross play for ps4 is allowed at the moment.
Edit: A few examples for cross play
http://www.thesixthaxis.com/2017/02/...ntendo-switch/
http://uk.ign.com/articles/2016/07/2...play-for-gwent
https://twitter.com/mykeryu/status/761704021312712705

PS Plus is needed for online play unless a developer does as SE has and provides all the servers and service themselves.

Some developers use their own server to run their games and still have to go over PS+. because this is about policies from Sony and nothing else. F2P and monthly sub based MMO are free. Simple as that. Which is great by the way, because microsoft for example isn't consumer friendly in this case and requires gold no matter what.

Edit:

That is not a technical issue, it’s a business issue. We’re on different platforms and each partner has its own ideas on which groups they want their players to be with.

From this interview with EOS developer http://wccftech.com/elder-scrolls-on...or-matt-firor/