A modern elaboration is https://statecharts.github.io/ https://statecharts.github.io/ - very clear explanation of statecharts, and why you'd want to use them (

A modern elaboration is https://statecharts.github.io/ https://statecharts.github.io/ - very clear explanation of statecharts, and why you'd want to use them (they're an elaboration of state machines) - and why you wouldn't want to use them very interesting, thanks to OP!