[fredcy]

This is much like the Elm Architecture [1], a pattern that I enjoy using. That structure gives me problems though when I want to speed things up by caching frequent calculations and lookups in the View functions. In Elm, at least, this is only possible by keeping the cache explicitly in the Model and maintaining it in the Update function. So it feels like considerations specific to generating a particular view end up explicitly in the more general update of the application-global Model. And for the Update to avoid doing lots of such view-value computations not needed by the current view, the Update function has to know a lot about view-only state.

[1]: https://guide.elm-lang.org/architecture/