I still think this would work as an anime. The Japanese wouldn't hyper focus on Steven like the crewniverse did. They'd have made him the main character, sure, but they wouldn't have tied the "every episode must involve him" anchor around their waists. Because really, the characters had so much chance to be interesting, but they weighted them all down by making the majority of their meaningful interactions with Steven and only Steven.
They may have kept the "all gems are female" angle, but they definitely would have gone for far more appealing designs considering the anime asthetic. Just imagine the whole show in this sort of style:
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Imagine if they had actually embraced the 90s anime they took inspiration from instead of doing every fucking thing they could to move away from them.
And maybe actually stuck to a fucking plotline more instead of wandering off on autistic slice-of-life episodes that nobody wanted and nobody really cared about that outright outnumbered the plot episodes. I really didn't care about the boring ass residents of beach city. A few of them were fine, most of them didn't make the show better with their inclusion.
It was a great concept, terrible execution. I think it's one of the few properties that could be improved with a reboot, assuming the original crewniverse have NOTHING to fucking do with it outside of being more or less George Lucas'd. In name only.