Campaign co-op is online only, no local co-op at all.
Splitscreen is two local players max and there's no LAN, so that means local MP is basically dead.
You can only do 1-on-1 or play together online, no more local free-for-alls or 4+ player deathmatches.
If anything I'm not reacting harshly enough, this is akin to Smash or Mario Kart removing or severely limiting local multiplayer. Literally half the reason to even play the game is gone, you can't play with friends anymore unless they have their own console, game and sub.