Yeah actually it was really fucking weird how Marco and the King felt like it came THIS close to having the peasants etc. call River out, but then swerved at like the last second to him doing something to get back in their good graces so the issue wouldn't need to be actually acknowledged. I don't care much about the Mewni racism/poverty stuff really (I like the dark jokes about it, but I'm not sure it actually has to be addressed), but it keeps feeling like they habitually come close to touching on that and then just quickly derail into some other tangent before it totally gets there.
Thought Moon the Undaunted had similar issues with never really talking much about the treaty, Moon hunting down the army, and what the former queen was even like. Like all that could easily be negatively viewed as even the recent Butterflys being tyrants etc. if someone wants to, because in trying to play it almost too safe they ended up not really telling us shit about either side.
Despite how some fans view it Star Vs. isn't The Monster Racism Show or Star Vs. Societal Injustice, and those subjects don't necessarily have to be explored in great detail/solved when they're more a part of the setting of Star's coming of age and all that. But it keeps feeling they want to or could address them more than they actually are, but then never do.