I probably played more Halo in my life than most or even all who commented on this situation and co-op campaign is damn important for Halo. I really think it's hard to Imagine how 343 couldn't manage to implement everything at launch with so much manpower and time and there thas to change something in this studio because there definitely is something wrong.
But I'm still happy to get the game end of this year as long as the campaign is really finished. I don't want to wait even longer just to get in half a year what I will also get in half a year without a delay of the whole game. If the campaign would be exactly the same then release it now.
I also don't give a fuck what reviewers or Playstation fans will say which seems to be the biggest fear of some people here.
It can get a 70 Metascore because of reviewers trashing the game for this and people in a few years would still love the game so much that Halo's future would look very bright.
The game also won't sell like crazy regardless of the Metascore with a f2p multiplayer and Gamepass. So Playstation fans will trash the game with a 70 or 95 Metascore and tell you how irrelevant Halo is compared to PS games. Who gives a damn...