I would be really excited to see this moving forward - saying as someone who uses Phoenix regularly (and likes it for the most part) and has used react, vuejs, and so on - even at the stage it's at is already a very promising DX with what looks like a very reasonable roadmap and clear intent.

Having elixir apps that can work seamlessly local-first would be amazing and take care of one of the only areas where phoenix can't completely cover out of the box, making things that today take a lot of glue code, and error prone, a matter of a few declarations.