We use Phoenix and LiveView to power all of our non-video interactions on Glimesh.tv[0] and the immediate out of the box features and performance are unmatched. LiveView allowed us to get a completely real time updating channel where streamers can edit their metadata (game, title, viewer count, etc) and all of the viewers can see it in real time. Not to mention we implemented a distributed chat system that sends message updates in real time to both browser clients and API clients. Both of these features combined amount to less than 1000 lines of code and "just work" across multiple web nodes.
It can be daunting to jump into such a strange world as a LiveView environment may look (Elixir syntax, OTP terminology, etc) but honestly once you dig in deeper, everything just makes sense. LiveView (and HEEx) continue to be very simple to understand abstractions on top of the rock solid OTP platform. It's a joy to build real time applications using it, and I very much appreciate the "developer experience" focus both Chris & Jose have for us Elixir devs!
I'm excited for the launch of Phoenix 1.6 and HEEx is shaping up to be a complete replacement for your traditional SPA + Backend API, and using one consistent language for your full stack really has very freeing & powerful benefits, especially for small teams!