Well, they have a history with it, sadly. For example with ouran high school host club, where they invented their own (sort of) conclusion to the anime which didn't happen in the manga, then with Noragami, adding a whole (and complete unnecessary) arc that wasn't even in the manga, fullmetal alchemist (2003), which is great in itself but not a faithful adaptation, etc etc :') bad fans complain about the adaptation but honestly if we compare it to other adaptations bones has done,,, I think we got kinda lucky. Tho it's veeeeryyy far from perfect :/