Coming from a Playstation player, I don't see why they're so pissed. Arrowhead had talked about potentially bringing the game to other consoles, and I think it's good that they are, because Xbox has given us a lot of great games. Personally, I welcome the incoming Xbox players.
Hopefully, this leads to a potential sequel. After the recent 'meltdown' at Playstation, they need to release something, and stop focusing on Live Service games. They need to listen to the community for once, because they're the gamers, they buy the products, without them, Gaming would be nothing.