Are 343 Studios really this inept with MCC?

Why is the Anniversary edition of Halo 2 so hard to play in coop? Even on FSR performance there are still so many frame rate drops. It boggles my mind why they didn't put black bars on the sides of the screen, 32:9 aspect ratio for each person is completely unnecessary and wasting performance. They could have had black bars to make 21:9 for each person, still allowing for an extended view but saving in a shit load of processing power needed.

Please tell me the best settings to play this game at, the frame rate is so bad in coop when anniversary graphics are enabled.