But don't you think all scales are merely just vehicles for achieving a greater goal - quality music?
Give an ammature some of the most exotic scales , all they'll come up with is a bunch of notes with no musical equivalence to it and give a good guitar player a pentatonic scale and they'll still be able to come up with a meaningful piece of music. Sure, pentatonic scales are easier and safer than other scales, that doesn't mean they're good or bad by default. It's the player's ability to mould that scale into something good or bad.