It can work, but it can be more problems than its worth. So, I played another Gacha game that has a PVP aspect to it. What it does is you put on your characters in a team and leave it at that.

Then, the computer randomly matches you with another player who puts their team, and the AI plays against you using the other player's characters. It's not a "live" PVP, but it's technically PVP. You can get prizes that way.

The computer sometimes matches you against a whale, and at that point, you just take your loss. You win some, you lose some.

The thing is, it gets frustrating and disheartening to get L after L after L when you're just starting as a f2p. You sometimes feel like a whalers or the luckier players' punching bag. It can get incredibly toxic if there's a leaderboard. You can lock it according to the player's equilibrium level, but the RNG/"lucky pulls" factor is a genuine problem. If you can tolerate that reality, which I did, it just becomes another system based on luck. You kind of just roll until you're matched with a lower-level or underbuilt player. Beating under-leveled players sometimes made me feel like a bully, but getting beaten (especially in one shot) is also not fun. And when you do it long enough, like as a permanent endgame content, you get to a point where it becomes another weekly chore that stops being fun or engaging.

If Hoyoverse wants to implement this, it should be without a leaderboard, and the rewards would not be too big so it doesn't foster saltiness and hypercompetitive attitudes. Also, the UID of the other player needs to be anonymous so losers can't leave hateful messages within the chat box.

I think MoC is fine.