Well of course it's going to help your sound if the damn thing's got a fault in it. It's not inferior, it's just fuckin' defective, homesI have an example. One of my guitars need fixed, as the D string buzzes when you play nead the headstock. My other guitars do not do this. And it doesnt sound great.
No matter how skilled I am, I cannot play without having bad buzzy notes on the D string. So telling me that "a better guitar wont help my sound" in this situation is completely incorrect. Either fixing it or trading it in for a better guitar will indeed help my sound.