I think they might add it at some point when all serious multiplayer issues are fixed on PC version
its not their priority right now
I do not own xbox or playstation still I think that if console players want to play with PC players and experience big multiplayer battles, they should not be denied this. they should have access to custom servers and multiplayer events.
I think reason why crossplay was not added was problem with downloading mods that modify game on consoles but idk, hopefully that will be resolved somehow