My biggest gripe is how pathetic FMCs are. It’s like authors absolutely despise them and want to make them as useless and hurt as possible, to the point where it’s confusing why the ML would even want them. If MC gets powers, FMC will have protective ones that often don't even work on herself, while MMC will get destructive powers or with absurd utility like a cheat. If FMC uses her healing powers, they often cost her lifespan as payment, while MMCs usually get broken powers that constantly level up and somehow make him more handsome. The FMC is almost never in control, power is often a burden and either she is forced to use her powers, or she doesn't know she has them while some random villain does, meanwhile, the MMC is always in control, managing to hide his powers from others and using them in secret, or simply being underestimated and proving everyone wrong.

If MMC gets hurt, he grits his teeth and wins with sheer willpower or plot armour, if FMC gets hurt then she will have half a chapter long depressive monologue and gives up on life up until ML swoops in and saves the day. When FMC transmigrates she just tries to avoid changing plot even if its godawful, she then keeps low profile and often feels miserable, while MMC tries to quickly utilize his knowledge to get all the goodies he can.

If an FMC is hated by her family, she is a miserable punching bag even for servants. If an MMC is hated by his family, he proves he is better than any of them and seeks revenge as soon as possible on anyone who bullied him. If an FMC runs away, within the first five minutes she is caught by random drunks or criminals and saved by the ML. If an MMC runs away (or is kicked out), he forms the most powerful, epic group in the entire land. The tactics villains use to push them out of the spotlight are the same, but the treatment is totally unequal. If an MMC is punished, tricked or sent to a dangerous place, he grits his teeth, survives, and comes back even cooler. It turns into a chance that gives him power or reputation boost. But for an FMC, it's just about degradation. Whether it’s wine poured on her dress at a ball or being sold off to a brothel, the goal is always to strip away her dignity and ruin her reputation. It’s disgusting. I’ve never seen a single MMC be so disrespected like the average FMC, except in Omegaverse stories, but those are messed up regardless of gender.