Sorry, I have to digress for a while (for the avoidance of doubt, I have the new Jake E. Lee CD and I think he was the most gifted Ozzy guitarist - and that includes Randy):
Steven W (everybody's favorite bespectacled-depressive Dark Prog nerd/intellectual) has chipped in with/against the Gretas:
https://www.loudersound.com/news/steven-wilson-slams-abysmal-greta-van-fleet-theyre-like-a-boy-band-led-zeppelinI like Porcupine Tree and his solo work (plus am thankful for his many excellent remixes of Prog greats), but what exactly is "abysmal" or even conceptually wrong with a "boy-band-Led Zeppelin"? Led Zep were a "boy-band-Yardbirds" themselves and milked/lemon-juiced Plant's sex appeal (which Keith Relf admittedly lacked) abundantly, they made/stole a whole song about an orgasm. Old pots calling the new kettle black.
Greta obviously fill a void for younger rock listeners who want to hear classic rock, but not see middle-aged men/senior citizens. If that gets them away from non-rock bands or the umpteenth shoegazer music combo, then I wouldn't mind if there were another dozen Gretas. Bring'em on.
As a Rick Springfield fan, I never had issues with someone looking gorgeous and still playing music I could like. You can't have it all.