There’s a concept on TV Tropes called Fridge Logic, which is what you call it when something totally makes sense at the time you were reading or watching it, but at some point after the viewing, maybe while you were idly staring into the fridge thinking of not much in particular, you realized that there was something fundamentally wrong with it. Sometimes it’s a plot hole, but sometimes it’s more subtle.
See, all the characters seemed super excited that they’d saved the day, and, carried away by acting and a strong orchestral score, you felt pretty good about it, too.
At least you did until now. Now you can’t remember why it seemed like they’d accomplished much of anything by defeating the bad guys…