Very similar to what we do on Flet: https://flet.dev The major difference is that Flet uses Flutter to build UI and can target desktop, web and mobile. Also, we use WebSockets for communicating with the server which gives lower latency (the delay between a click on a button here https://pynecone.io/docs/getting-started/introduction and UI update could be annoying).
We thought about adding web socket and are still debating. The latency here is not from our framework though its from our server getting slammed with hacker news and reddit from our launch lol. We found the overhead of sockets not worth to for the majority of our apps.
Seems like this could be a major barrier to scaling, especially if /all/ reactive state has to be handled through the server. Maybe a future feature could be a WebState class that provides reactivity only on the front end?