Right there with you. The mark of a discerning writer is knowing the rules and when to break them. When I break a rule, it’s out of choice, not ignorance.
Ditto for dangling prepositions. Churchill’s famous witticism about the editor moving his prepositions being “a form of insolence up with which I will not put” is clever and all, but in fact the up in “to put up with” something is not a preposition but an adverb. The difference is that between backing up a file on your computer and backing up a hill in your car. The correct rephrasing would be “with which I will not put up,” which takes some of the bon out of Churchill’s mot.