Sure, but once you stray from blanket rules, it's harder to state categorically that 300 is an imperative to fix, and harder to prevent it occurring. e.g. a bl

Sure, but once you stray from blanket rules, it's harder to state categorically that 300 is an imperative to fix, and harder to prevent it occurring. e.g. a blanket rule that a header file isn't allowed to include another header file is trivial to enforce, one which says it can't be more than n deep, is subject to boundary pushing.