So I’ve been playing this after all, and it’s a bummer how they don’t let you play as all the characters in the coliseum. No idea why either. Some seem perfectly playable (Hordy, MiHawk, Aokiji, Kizaru, etc.). And the main story is just as clunky and rigidly level-based as I remember. Man these maps are bland. I really miss the old Unlimited games…
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That said, I’m having fun. It’s an enjoyable game when you don’t look at it relative to the others in the series.
I would guess because it was a handheld console originally and they weren't arsed enough to update it once it was made for the PS4/Switch.