I think I saw this one. In many cases there are some crazy good, purpose built solutions that are better than what Erlang/Elixir can offer, but that requires learning and managing all that tooling. Often, good enough is fine - especially for small productive teams.

I'm on my second team that has adopted Elixir and it has really helped our productivity being able to keep so many capabilities in one kit.

That's basically it, yes for sure I could install some external pubsub software & associated frontend & backend boilerplate with any other stack but I just wouldn't bother doing it for just refreshing a tiny counter whereas with phoenix pubsub & liveview, it's just one line of code.

It helps you to add lots of tiny quality of life improvements to your product that you wouldn't bother with normally.