Comment by ryanbrunner

I don't think it's a case of guard clauses being more or less readable in and of themselves. The point the authour is trying to make is that guard clauses convey a different intent from a standard branch. It's a way of communicating "this method is not relevant / necessary (or sometimes invalid if you're raising) for this set of inputs". If what the guard clause is doing is the "point" of your method, you're losing that intent from someone reading it, and conveying something else.

I don't think it's Rubocop's fault in this case - there's really no way that we can expect a linter to glean "what is this method really about". But structural issues like this probably don't make sense to use a linter for IMO.