Refer to my forum post here:
https://www.halowaypoint.com/en-us/forums/6e35355aecdf4fd0acdaee3cc4156fd4/topics/loadouts-in-custom-games/0120adca-3c31-47c1-b305-18cceac9bff5/posts
There would be literally nothing to lose by adding this, as it would be optional to include more than 1 loadout in custom gametypes, as it was in halo reach and halo 4.
While having options is always nice, there actually is something you lose if you do that. Devs have to prioritize their time and resources, so if they focused on implementing loadouts just for customs then we’re losing out on whatever they’d have implemented instead whether it is better menus, new REQ’s, new gametypes, or other things. It’s opportunity cost and there is way too much I’d rather have them work on than this.