About a decade back Bret Victor [1] talked about how his principle in life is to reduce the delay in feedback, and having faster iteration cycles not just helps in doing things (coding) better but also contributes to new creative insights. He had a bunch of examples built to showcase alternative ways of coding, which is very close to being HUDs - one example shown in the OP is very similar to the one he presents to "step through time to figure out the working of the code".