i feel like people are kinda overstating mementos' potential viability with hazards off
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for starters, that thicc top right platform is almost 100% not a drop through. that's already enough to not make it legal
second of all, the stage is too asymmetrical and weird to be fair to both players. the player who spawns on the right has a slope that they cam crouch on to low-profile a lot of moves, and a solid platform that can give them shielding against aerial approaches. for example, a 'chu camping there spamming neutral-b would be hell to deal with
third of all (is that a thing people say), it's huge af. our ruleset already kinda unfairly benefits offensive zoners and speedsters while harming very slow charaters like ganon or bowser, and this would just be another big stage that would overall hurt their viability for something they have no control over
and lastly, there may be issues with copyright. iirc big sm4sh tournaments weren't allowed to play on third-party stages because the companies would get antsy about their music being streamed without them getting any recompense from it. idk if atlus would be like that but that's potentially an issue that can arise as well