It's opinionated in a way I dislike. I don't actually have anything against opinionated software--tailwind is very opinionated about how you should write CSS but I like it because it matches up with how my mind works. But I find Django very jarring. I can't point to a specific thing about Django, it's more that if I were to design a framework from scratch it would look nothing like Django, so I experience a lot of friction trying to shape my ideas about how to build an application into Django's way of doing it. I have the same problem with Rails as well.

I agree with you that Django provides most things that an application will eventually need, and if I were managing a team that was starting a project from scratch I think Django would be a reasonable choice, but aesthetically something about it irritates me.