Halo Infinite you need to be able to look around and move ie the core fundamentals.
Left and right thumb constantly occupied.
That leaves Jumping, Aiming (zooming) running, crouching, sliding, reloading, switching weapons, melee, equipment and grenades. Those actions are supposed to be able to execute while moving and aiming. That are 9 actions preferably done while moving and aiming. With only two back buttons that leaves one action where you're forced to use your thumb which means you can't move or look for a brief second. And this hypothetical comes from using a pad with two back buttons. So even going the extra mile you're still at a organic disadvantage regarding a smooth experience.