Curiosity here. In the AES archives was there ever testing done on human hearing? Bright, Warm, Textured, Cold, Dark, are all perceptions and caused by our experiences and inherent ability to hear physically. I would love to see a test where each paricipant in a double blind study went through a hearing test first.
Probably not much. But it wouldn't matter much anyway. Anyone with hearing acuity from good to moderate loss would be able to make valid subjective judgements, because their reference is the sound quality of life. Their subjective judgement would be how similar a sound reproduction system sounds to real life. Even someone with moderate hearing loss can do that to an impressive extent.
DBT is a comparative test, and again, anyone with excellent to moderate loss would be able to compare two choices well enough to match up the unknown.
Severe losses in hearing would make anything involving sound difficult, so they may disqualify themselves from a evaluation panel.