You can try and find some aspect of the game that Halo Infinite is doing different to some other games and say that's the one, single thing that totally explains away why the whole game looks so lackluster, but I think this is plainly a reaching and desperate argument.Game design decisions outweigh graphical decisions. You cut away draw distance, you get massive pop-up issues. It's not so simple at all. There is a lot of verticality in this game.
Again, there are ways to optimize such a thing to where it's not hitting demands so hard(especially on the GPU). There is just no way on Earth this is such a critically extreme demand that it's destroyed the visuals of the rest of the game so significantly. And if it is, then they've messed up badly all the same through lack of being able to optimize it to some reasonable level and letting it hurt things so much.