I take your point, which is that jailbreaking is good if what you want is to run random unapproved code on your machine. But you didn't seriously engage with the comment you rebutted, because it is also true that jailbreak prevention prevents persistent kernel compromise --- is in fact a predicate for preventing persistent kernel compromise --- which is a thing that really does happen; in fact, it's far more relevant to the overwhelming majority of Apple users than running unapproved code is.