Sketch is an extraordinarily solid piece of software and they continue to use Sketch to build Sketch; meanwhile, show me someone who hasn't shipped an outage and I will show you someone who has probably never seriously worked in infra, so I don't really see what the high-order bit of the observation is. I have literally seen this exact pattern --- a refactoring PR that flipped a continue to a break --- cause an incident in human code (which is what all code was up until like 9 months ago).
i don't know how to explain my points any more clearly than i have, so if you don't grok the intent then i guess we're at an impasse, and i guess also to my points you would be someone in the "llm maxi" camp :)