I’m still amazed at the myths of Class D sound. When I ran ICEpower amps 10 years ago I’d have audiphiles come over to my apartment in San Francisco. Not once did they ever say "Oh, I can tell because..... that this is Class D."
Truth is none of them could.
By extension, I have trouble believing that GaN amps are going to make anything very different in sound, but the desire for modernity in audio gear is ever-present.