The whole point of the episode is that the demons act in a way that emits sympathy and empathy in the humans and viewers. Despite Frierens claim of demons having no empathy, her lack of detail and expression, and the contrasting behavior of the demons makes you wonder which is true. Which remains an ambivalent state for a while through the episode.

The conclusion is that the demons themselves do not have empathy. But the main theme of the episode is demons being depicted sympathetically.

I assume this is arguing in a way that is missing the point they were trying to make. But I'm going with what they wrote rather than guessing implicit meaning.

That seems to be a reference to anime's tendency to make its villains sympathetic at any cost.

No way. That's most definitely not why they chose their villains like that.

Frieren’s Demons Are The Perfect Villains, Despite Their Lack Of Depth

I think it would be hard to give them depth but at the same time make them undeniably evil. What would that kind of depth look like? So I think the lack of depth serves them being undeniably evil.

Frieren’s demons are incapable of being sympathetic because of their lack of human emotion, and that makes them the perfect villains for the series. The overarching theme of Frieren is the importance of embracing emotions and bonds with others, with Frieren’s character arc, specifically, being about her journey to be more in touch with the emotions of herself and others. As such, demons being biologically incapable of human emotion puts them in direct contrast to the overarching themes of the story, making them the best villains for Frieren: Beyond Journey’s End, […]

The lack of emotion being in contrast to Frierens discovery of emotion is certainly a valid and interesting point. But I don't think it brings anything to the story or Frierens journey or the contrasting. It's unrelated.

While there’s nothing wrong with a story making its villains sympathetic, seeing it be attempted so many times across so many different mediums destroys the novelty of it, especially when the results are so often lacking.

I can agree the implementations are often lacking. But that's unrelated. Many things are often lacking.

Shallow characters and clear good vs evil setups may be more difficult to fuck up, but they are also inherently shallow.

I'm pretty sure I see purely bad-depicted villains regularly too. It's not like there are only those that are complex or made sympathetic or reasoned with a cause.