But we don't want the data and code to be the same, we want the data to be less dynamic than the code. You can't find out what the UI of a Lisp program would be without executing the program. It has everything available all the time, which is bad and turns you into a Lisp weenie.

SwiftUI is using new Swift features sort of similar to Haskell's "do" notation, which isn't actually itself monads.