I did a bit of google searching...alot of the publications require some form of university access or journal access that I do not have....but after some bits of research into the whole "slime layer" discussion...it is seemingly clear that the importance of this protective layer is critical to fish health, morbidity, and mortality...there are a good number of studies that appear to support this, I read some of the abstracts, and the premise of things like "time out of the water", "handling", "dry surfaces in contact with the fish" all have been shown to in various manners in studies to have deleterious effects on fish health...the one study I found out of university of ontario (couldnt access it) suggested that the bass mortality could increase by a factor of 68% related to handling and time out of water....
My point is, I do not think it is much a stretch of the imagination to assume that a bass flapping on a dry carpet, then picking it up, then unhooking it, could be more deleterious to fish mortality than wetting our hands, lipping the bass, and quickly releasing it...and if you use a net, you can leave the fish in the water until you have your camera prepped...and an additional thought, I probably shouldnt net the fish, then lay it on the carpet in the net...sorta defeats the purpose in part, hadnt actually thought of that really.
Food for thought.....
And a final thought...if you are claiming that a bass flapping on the carpet or the deck is not significantly more harmful to fish health, then at this point (given the apparent consensus about the importance of the protective layer, which is based on a body of evidence), you would have the burden of proof to show that it is in fact NOT harmful, or not significantly harmful anyway...
Ok, geek time over.
PS - yes, catching a fish with a hook and dragging it through the water is harmful to the fish, or at least stressful...no one can argue that I think, but that doesnt mean that doing x, y, or z in addition to that baseline stress will not be significantly more stressful and evetually more harmful to the fish...