Ok, so less "prototype in the browser, then offload to a server once it works", but more for local "app" type things? Interesting idea, has some limitations but also opens up tons of interactions that are harder for a server-based solution (webcam, ...)

Bingo! It's always evolving too. We do use a lot of experimental flags from the browser, this helps work with up and coming features as well for learning about new APIs very easily.