They're "full stack in the sense that you can render templates and manages static/media files. Back when we only had websites, this was fully full stack for sure.

I don't know about the others, but Rails has Hotwire and Phoenix has LiveView, which are both excellent frontend technologies.

At least for Django, it handles creating client side views, client routing, etc. You can of course use a different frontend, but that's included by default. See also its wonderful admin interface.

Rails definitely has a front end, by default anyway.