Perhaps this is a hot take, but human language is a phenomenon that arose to facilitate communication between humans. Anthropomorphization, by extension, enables both easier and more effective communication.

I also fail to see the benefit of not giving the models an anthropomorphic internal sense of self - even if that only ends up amounting to a set of instructions for an unconscious machine to mimic humans more effectively. Is the alternative essentially a mind so alien that it’s intentions are even harder to read should it become misaligned, while also being harder to communicate and get work done with?