Re: The controls, Halo Infinite is a poster-child for why many, many gamers would just prefer the developer design the controls and force players to get used to them, rather than giving players a cornucopia of choice and saying 'make the game control however you like'. Most gamers don't have the 'vocabulary' necessary to understand what facets of control input they like and how they like them, they just know when the end product 'feels good' or 'feels wrong'.
Also, the 'auto-aim' in Halo Infinite (a combination of reticule friction and bullet magnetism) is somewhat odd. At the default state, it's very sticky. It even pulls a little bit toward the target.(seriously, there are videos of people testing the game, and one player has his hands off the controller, another player walks past the reticule and the reticule nudges ever so slightly). However, as soon as you begin firing, that falls off a cliff, and the player is almost entirely responsible for the minute adjustments without a ton of help from the 'auto-aim'. Basically, as soon as you start shooting, Halo Infinite has some of the lowest 'auto-aim' of any Halo.
This (as well as trying to break habits from playing Destiny 2) is why I spent so much time in quick play before jumping into ranked. I wanted to see how I naturally compensated. I was never aiming to hit Onyx or play in tournaments, so I figured I would save time and stress by just leaning into how I play than trying to find the "Best" controls to potentially maximize my ceiling after thousands of hours or whatever.
So, how I play Halo:
4k @60fps on Series X with input boost on my LG OLED. Basically, there is little to no input lag to account for. Your sensitivity settings DO need to account for input lag. I recommend researching your TV to see where lands on the general spectrum.
120 degrees FOV. There's a lot of distance across my screen, so I'll rarely if ever need to move my reticule from one side to the other in the midst of a gunfight to combat multiple enemies.
Lots of left-stick movement and crouching. When I get into battles, I'm that asshole strafing back and forth rapidly, using my Elite controller paddle to spam crouches, etc. That's a lot of small changes to reticule placement that I have to account for with the right stick. I quite simply do not have the thumb dexterity to make those adjustments at a high right stick sensitivity.
After playing a ton of Halo Infinite, I decided that I needed a much lower sensitivity setting for the right stick than I've had in any Halo before. In previous Halos at 90 degrees FOV, I had to be able to move the reticule across the screen to move between two targets that, in actuality, were relatively close together. I was playing at 5 or 6. In Halo Infinite, I'm playing at 1.5(V) and 3(H). I also dropped the ADS multiplier down to 0.7 from 0.9 (and if I'm having a rough day in BTB, I sometimes drop that down to 0.6).
To compensate for this, I turn the acceleration ALLLLLLLL THE WAY UP and turn the max input threshold at 0 (basically, the stick has to hit the edge of the well to reach the maximum). If and when I need to back off a fight and retreat, I can't be stuck slow-turning like a character in the original Resident Evil. And rare am I in an 'oh shit oh shit oh shit' situation and not pushing all the way on the stick. So max threshold just spreads out that acceleration a bit and gives me a bit more room to operate before my camera starts cranking.
Deadzones. This is where shit got weird for me. On the left (movement) stick, I set deadzones to 0. On the right stick though, I set it to 2.0. To be clear, the sticks on my controller do not respond differently, and neither have drift. This is purely psychological. I am so comfortable, after so many years of input lag, with just the slightest touch of delay, that having 0 deadzone, while more responsive, completely f***ed up my aim, I was overshooting almost every adjustment. I, personally, needed just the slightest touch of delay for the aiming to feel 'natural'. This is COMPLETELY personal, and is not only dependent on my controller, but my TV as well.