This is good, I would add that “made up composition rules” are instead “made up composition guidelines”, that people should learn how to deviate from after constricting themselves with false constraints
Artists will not have a common answer to "Are there any rules in art?". Personally, I think there are patterns in art, and there are often rules that can describe those patterns. Oddly, I think the word rule works out OK. 'guidelines' is problematic in another way as it also implies that one is being guided towards a certain aesthetic/end result.
I feel like your definition of rules is my definition of guidelines, and vice versa