Gosta: Your rule is simple indeed, but flawed. You base it on a debate from other people, AND, you give it a long time to develop. Why not “solve” it once and for all: try something for yourself. Unless you don’t trust your ears, that’s really the only way to know.
And what “clearly matters”? And why is it different than “a tweak”? More importantly, why do you think this “other people” never “invest” in “what clearly matters”?