Is depleting your magic halfway through a fight usually bad gameplay? I mean, I know at least one RPG where it's actually not a terrible playstyle, because you're less likely to die from "Not enough MP" and more likely to die from "Didn't nuke the enemy hard enough", not to mention the problem of packs. (i.e. if you can handle 5 enemies of type X but it's challenging, then 6 is rapidly approaching TPK, and 4 is far safer, so fire nukes to get their numbers down fast. In a game where enemies are intelligent or operating in packs automatically so that you can't one-at-a-time them, burning MP early, even burning out, is a good tactic, especially if natural MP regen is a thing. EDIT: In a game that tries to model combat semi-realistically, where you get weaker the more you're hurt or strikes cause injuries, burning out MP fast is plausibly one of the best tactics.) Of course, in that case, you have to make it clear that it isn't a bad playstyle, I guess? It has to not be bad gameplay in the story.