Fun fact: most companies doing "scrum" actually don't have retrospectives.
(I understand that this goes completely against the textbook idea of scrum, but there is always the textbook and "the way we do scrum at our company", and those two often have very little in common.)
As long as you fix things that don't work or make you less effective, it does not matter if it's a retrospective, or stop-the-line approach, or whatever your nameless approach is.
Basically, retrospectives are a common tool, but the goal is to talk about optimizing how you do something, and to keep doing that.
