So I figured out why Game Freak is doing this. Masuda, in interviews, is talking about "animation quality", and "balance", but that's all excuses to mask the real issues. I mean, really, THIS is what you'd call "quality animations"?
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With characters LEVITATING off the floor?
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But no, the real issue isn't this. The real issue is the thing that's made very clear in this video right here:
You see that Steelix popping in? Notice how the smoke and black hole effects above appear WITH IT. That's not its own thing, that's a part of the model. Every single Dynamax'd Pokémon has its own, oversized model, and I think THAT is why Game Freak is cutting on Pokémon, because otherwise they have to make a model for EVERY Dynamax'd Pokémon, resulting in a ton of bloat and not fitting in any Switch cartridge or the console itself.