Even normal fantasy is starting to become trashy like isekai, maybe even worse. AFTER killing the demon lord her party deems her useless? Wtf? After going on an entire journey to kill the demon lord, they don't even betray her to steal the credit or take her down because she's more powerful than or something, they just say "wow you're useless even though you sealed the demon lord". Did the writer even think about this for 5 seconds?