Another Django -> Phoenix dev here. Currently I miss Django's model field types (UrlField, EmailField, etc) and will probably write them if no one else does soon. I sometimes miss South style migrations when I'm prototyping but doubt there's a good reason to implement them in Phoenix. For building JSON APIs JA Serializer is a quite capable alternative to DRF-JA.

For the Django Admin there's ex_admin which I haven't used yet but it appears to take a bit more work than the Django Admin does.

I haven't felt like virtualenv + pip was too bad for deps and deployment but exrm is already comparable/easier with an even better `mix release` planned for this summer/fall. No uwsgi or gunicorn to configure and even nginx can be skipped.

For the last part of your question: the biggest thing missing from Django was a good way to do websockets. Django has channels now but I doubt they'll work like Phoenix/OTP/Erlang (especially in the concurrency and fault tolerance categories).