> how would some typical frontend benefit from this

At ElixirConf I built a simple supervisor DOM tree model. When we are ready to implement it for real we're going to experiment with mapping the DOM to a supervisor. Each node being an element. This way events and rendering take place in each node in the supervisor tree. Rendering would be diff based and merged its way back up. Events would be captured as messages in the idiomatic Erlang/Elixir way.

This is all guess work right now and we don't yet know what will be practical vs what sounds good in theory.

However, we are dedicated to the idea that the programming model of the BEAM is one that complex client-side applications will benefit from over what JavaScript current offers.