The thing I really miss from Django is the admin scaffolding. Phoenix just isn't there. In practice, you could continue to use Django as a front-end.
I moved away from Django when the recurring question of "this is neat, but how do I make it keep going no matter what?"
The problem is that I was/still am a rookie of a programmer. I could not wrap my head around async in Python. I just wasn't getting it. I had a nagging sense that it was going to fail in the middle of the night and there was nothing I could do about it.
So, enter Elixir, which actually has a syntax that is kind of close to Python. It made immediate sense. If you want to do something that can cause the program to fail, do it in a process and send a message back with the result. If the program spawning the process fails, the supervisor will restart it!
Sorry - back to your question - and this will probably disatisfy you, but the answer is that everything was neat. It was just simple CRUD stuff, but doing it in Python didn't feel "robust" enough.
I'm fully aware that my reasons are superficial, but the way Elixir works has made me way more confident as a programmer.