“Steven Universe has no filler.”
Yeah, they have episodes that contribute ever so little each time that it’s almost insignificant on its own, and isn’t that much significant either because there’s so little of it.
If only 1% of an episode actually mattered, then 99% of it is filler. Steven Universe basically ignores the Chekhov’s law in writing, “If it’s not essential, don’t include it in the story.”.