I assume 3. It seems like a good number because then you have enough slots to have a loadout for every niche, short/mid/long range; but you don’t have a ridiculous amount where you have multiple loadouts for each niche (well you could but then you’d be missing 1 or 2). It’s also not like you can only have 1 loadout so you have to change it every game to adjust to the map.
So yeah, having 3 loadout slots seems reasonable. Maybe, 4 could work too…
I would say anywhere between 2-5. That seems reasonable. But 3 would definitely work the best, not too much to chose from, which means certain items well rounded more than specialized.