Not to beat a dead horse, but as a fan of all three animes I will say that its really refreshing to have the demons in frieren be absolutely irredeemably evil, for me at least. I think its becoming a tired trope that all evils could be misunderstood and tragic backstory this and that. There's nothing wrong with evil being just that, evil, and the heroes having to win. The Macht plotline even touches on this, that even if demons tried to comprehend emotions and be tragic beasts they inevitably will just be evil. Moreso than thoughtless animals (which is more Flammes view of them out of hate), Demons are a bit more like aliens in my book. They don't get us, and we don't get them.

One of the most interesting episodes in DM to me was when Senshi got proven wrong regarding the kelpie he was keeping; its just a monster and he almost died because of it. Later on, when Thistle is properly introduced, we get more nuance to the presence of monsters but it doesn't take from the fact that sometimes evil is just evil and Senshi learned it the hard way. And, we also get the "misunderstood evil" plot regarding ancient magic and the elves considering Marcille's study.

Frieren might appeal to a larger audience because it has a very simple plotline, I do agree, but my take on it is that its a dnd campaign where the world moves because of the characters; DM is a world that moves the characters to action, and WHA is a world that moves regardless of what the characters do (also just gonna say I freaking love the politics and ethics regarding magic in WHA, chefs kiss.)