343 cant make Halo cause Microsoft wants Halo The Product, not Halo The Game.
They dont want couches of happy people playing Blood Gulch, they want preorders and that "marketing moment" they got with Halo 2 and 3. They dont care about the franchise as a thing to be enjoyed, they only understand it as the thing that can be sold, and it shows.
343 devs have gone on record saying the rework of the core game and the stagnant development was due to MS saying "no, thats TOO Halo, you have to make the NEW THING." And thus we get clusterfuck stories, reworked weapons for no reason (seriously, ANOTHER new pistol and they get rid of the SHOTGUN?), ziplines pulled from Apex Legends and more out of game marketing collabs than in game content. Oh and a shit TV show that Neil Blomkamp shouldve gotten greenlit to make 10 fucking years ago.
Also the PC port of Infinite is trash. You cant give any player input without the frame rate going bananas. Stand still and I get 60 FPS, any motion its 5.