This isn't a new concept, other examples include Solara (React-based) and NiceGUI (Vue-based). It's very practical for internal apps, if you accept that all controls have a small delay due to events being processed server-side.
Thanks for sharing! I wasn't aware of these frameworks.
As for the events being processed server-side, this is exactly where FastUI differs from any other framework I've stumbled so far - the widgets are sent to the client, and it knows how to render them, so just like any other js framework there's no roundtrip for every keystroke.
