I think the main benefit is that every function relying on the stop variable is clearly defined as such, as opposed to having to find out manually who is relian

I think the main benefit is that every function relying on the stop variable is clearly defined as such, as opposed to having to find out manually who is reliant on it based on usage; its not so much moving complexit around as it is making things more explicit. im not sure how useful this is in practice though, for the common case