I still fail to see anything baffling, but ok. Let's try again.
We have a few ways to do it. We can do random map, you bring 1 loadout to work for every possibility. We have random map but you pick loadout depending on map and mode, so 3x12=36 options. Pretty good! But then we have this baffling choice of locking down two maps, which change everytime. This means you have to prep for these two maps. Let's say we have map A, B, C. I may want Loadout 1 for A and B, but not for B and C, so we make Loadout 2 for that. None of the loadouts fit that great in case for A and C either, so we create Loadout C. And this is just with one mode in mind; the optimal loadout might change depending on mode. So that's 9 possible loadout just by combining 3 maps, with 9 maps not brought up, meaning hundreds of possible loadouts.
You might think this is baffling logic, and there is no way anyone would actually do that, but I know first hand I haven't brought Slosher again since the particular combo I experienced, and I haven't even begun to care about what clothes I wear and the effects they give. I hope I finally make some sense and if I somehow don't, that we at least can agree to disagree.
You can read this reply as well then, altho I don't think it will sway you!
Each map doesn't need a custom loadout. You have have 5-10 premade loadouts that you customize outside of matchmaking so you don't waste people's time. When a map comes up, you have 30 seconds to choose from those 5-10 loadouts.
Come on, son. Call of Duty did this in 2005. It's not a complicated concept.