I don’t slag Greta Van Fleet for sounding like zep. I dislike them because they don’t play and more importantly sing within their own limits. Look, the dude singer has talent. But he’s not good enough to do the kinds of things with his voice that he’s trying to do.
One can only do so much with what one has, and yes, he’s good, but not good enough to pull off the material in the way he tries to do it.
PS> Blues singers have been sounding like each other for lots of decades, and it’s all good, provided they are GOOD.