@icedquinn funny you mention hard real-time; Erlang and its VM were specially created to run telecommunications servers, stations, and routers, so high-reliability and latency is super important there too. wrt writing UI code, a more functional approach fits tree-style programming very well. from what i can tell. you may want to also look at Elm UI architecture as well as the Xilem UI architecture that was inspired by Elm but adapted to Rust.