I always love them. It makes the world feel like it exists beyond the story. Even in bad stories. I literally just finished Darling in the Franxx yesterday, and while I was severely disappointed with the quality of the show, I still liked seeing how these characters (whom I mostly didn't care for) change over time.
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That seems to be their biggest advantage, from what most people have said. Helps the world feel like a real place. They seem to be a lot more well received than I was expecting to hear, too. A lot of folk have said they like them! ^-^