I remember a glitch in Halo 3 on MCC where you could do a three player split screen. They fixed it, but 343i were wanting us to have the best experience and that was taking away splitscreen in the first place. If having a 3-player splitscreen lowers framerate and people aren’t mad about it. So I think they should stop at just splitscreen in Halo Infinite. I think they should just jab in a 4-player splitscreen for the campaign. I doubt people will care about the fps and will be happy with it.
They need to make matchmaking campaign a thing again. Haven’t had it since Reach
If they have one to two player splitscreen in 60fps and three to four player splitscreen in 30fps for co-op, no one will complain that they’d rather not have the feature at all.