It's not the real time nature that makes LiveView a potential breakthrough, for me, but the additional category of interactivity it gives between "server side rendered" CRUD app and full SPA. Most apps in this zone are probably using jQuery or sprinkling in react, the former of which gets pretty messy and buggy in my experience, and the latter of which is overkill and leads to a much more complicated build system and developer environment.

It uses websockets, and I think websockets are probably necessary to implement the feature well, but that's not what I'm excited about here.