I agree that constraining yourself can be a useful exercise on the path to developing taste. The advice arises because it is useful at some point in the learnin

I agree that constraining yourself can be a useful exercise on the path to developing taste. The advice arises because it is useful at some point in the learning process. I think we agree on the basic point too, which is that taste is the ultimate goal and good taste will never exactly align with any given grammatical constraint. Your example notably ends with lifting the restriction and relying on taste to decide between the alternatives. The problem is when people internalize the advice as an absolute, rather than the tool that it is.