Halo Infinite should have hitmarkers and the weapons on the ground being outlined as options that we can toggle on and off.
Destructibility should be on par with Halo 3 such as making Phantoms destructible again with debris. At the moment I do not know where the destructibility can be incorporated other than the Phantoms, Spirits, and Pelicans.
I would like another game mode like Firefight or Spartan Ops.
Playable Elites with customization on par with Spartans in Halo Infinite or at the very least Halo 3. Heck go beyond our expectations by including playable Brutes along with customization or even all characters being playable in Forge and Custom Games.
Weapons and vehicles returning from previous games to provide a more diverse gameplay experience such as the Elephant, Falcon, Spectre, Prowler, Sticky Denotator, Grenade Launcher, and Brute Shot. I would love for basically all unique weapons and vehicles to return but I do not believe that will ever happen, but with mods it could. For instance, the Assault Rifle, Storm Rifle, Plasma Rifle, and Suppressor are not all necessary but replacing the development time for the Suppressor and/or Storm Rifle with a unique classic weapon or new weapon would provide a different experience.
Dual Wielding, even if its just in custom games by toggling it on and off. By restricting it to custom games and maybe exclusive multiplayer game modes then it does not need to be balanced but just a feature.
Mod Support, at least as in depth as Halo Custom Edition. I am not familiar with mods but I want the level of modded multiplayer and campaigns as seen in Halo CE.
Equipment and Armor Abilities returning even if its limited in the campaign and only available in custom games. This provides players more options for custom games as well.
The return of Sentinels and Sentinel Enforcers since the game takes place on a Halo ring.
All game types from previous games, including game types 343 left behind such as Invasion and Dominion.