

Even co-op in gacha games doesn’t qualify as MMO, because for that you need hundreds or thousands of players being simultaneously in the same persistent world. This is the same reason why games like Dota, League of Legends or Counter Strike aren’t considered MMO.
This is min-maxer mindset and I would hope randomized systems like this will prevent it but unfortunately no: even here some people think they actually need to roll every dice exactly the right way. I don’t think it’s true that this is really necessary. And no, it is not necessary to do top 10 world parses; you can just beat endgame content on modest, casual difficulty and call it a day, rather than try hard to set a record.