I'm not sure how you're bringing morality into this. I'm simply viewing speech as communication and nothing more. Vocal fry increases noise in the signal to noise ratio, and I don't see how that could be useful.
Slouching = laziness = a moral value, dude. The point is it's not a choice, and even if it were if efficiency were a primary driver of language then we wud all b ritin lk dis n im gesin u dont car 4 dat ether.
