Thanks, that makes sense. Interesting perspective on the UI = F(data), I did not know that. I still wish the mechanics were a bit more... intuitive... I guess? Personally, I'm a big fan of The Elm Architecture [1]. I felt that is a very nice way to separate state and logic. But I'm not such a big fan of Elm itself (subjectively).
[1] https://guide.elm-lang.org/architecture/