It's something I see a lot with the occasional rewrites that float their way onto my dash—This idea that, in a better execution of Miraculous Ladybug, the yin-yang duo would be perfectly balanced. I'm sure it's just a cause of fatigue-induced contrarianism, but I think it and a lot of the usual checkbox-fixes ML rewrites try to add in come off as a little close-minded?
It's a symptom of what I think is a broader issue with how creatives, especially creatives within fandom, approach magic systems. There's this conflation of "good writing" with an extremely detailed, perfectly balanced, and granular power system, and beyond that the conflation of it with the idea that you need to have an explicit answer prepared for everything. The quality of a magic system, in that case, comes down to how close you can get it to the Platonic Ideal of a trading card game. Themes and greater symbolic value are stylistic flair, if not trivia for the description of these metaphorical trading cards.
I know that Ladybug and Chat Noir are in theory supposed to be equals in the fights, and working off that maxim would lead to them both having things to do formula-wise in those fights and so on, but it's such an easy fix to just put whitewash over this obvious writing flaw, don't you think? Especially when, say, the powers could be inherently unbalanced from the start and these two characters could want to be equals regardless and have to struggle with the concept that one of their miraculouses is inherently deemed "lesser". If you tried to ask me if I'd seen a rewrite with that concept before, I genuinely couldn't name one, and that sucks because reconciling their broken powers could lead to a lot of nice, tender Ladynoir moments.
Is it just that we've gotten to the point in fandom where everything in consumed by way of trivia and powerscaling and blobslop? Is it an allergy to "unfair" power systems? Are the popular fixes just popular because they're easy to replicate? I genuinely don't know. The phenomenon intrigues me.
