It’s just an idea I had from a game design perspective.
Nier: Automata is one game with which I saw a lot of people complain, as the game does nearly nothing to get you to actually experiment with different weapon combinations and plug-in chips, and a lot of people overlook those systems because of it. And hence the experience of some players suffered.
Pre-set loadouts in arenas could have been used to address that design problem by showing players the possibilities.
Although, it wouldn’t necessarily need to be mandatory. Each arena fight could come with a “recommended AC” for countering the opponent, while still allowing players to take in their own mech should they want to. This could have come with the fights being a lot harder as well, making using your own design viable only if you know what you’re doing.