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Take Mewtwo who is just a powercreep adjusted Alakazam, who is trash. Or Fug who is a souped up SFMA. But they're at just the right power level to fit in and make the meta healthier.
Mewtwo doesn't win many 1 on 1s against offensive mons, but would be perfect to wallbreak and keep setup gimmicks in check which there are too many of right now like Annihilape, Shed Tail and Espathra. Fug would raise skill ceiling by being a very high risk high reward setup sweeper in its own right, he himself is setup fodder
Weather is in shambles right now? No problem, bring in Kyogre and Groudon, it would stabilize the meta and reward well crafted teambuilding. Or even Lugia and Ho-oh, to give defensive cores the power they need to keep up with the escalating extreme damage
The precedent is already more than set. With over 600 BST legendaries like Kyurem, Zygarde or Genesect having even dropped to OU, UU or even RU due to their bad stat distributions and/or abilities.
150 offensive stats and 130 speed just aren't crazy good on their own anymore, without an OP ability or move to abuse ontop of it. Power crept mons like Maushold, Espathra, Gholdengo, Glimmora, Roaring Moon, and Meowscarada outclass old gen legendaries, it's clear to see
