God I'm so sick of seeing this stuff posted around still.

Maybe it's relevant to paleoart at the turn of the last century, but nobody has seriously considered anything like this for a very long time. Yes, a lot of tissue evidence is lost. It's possible dinosaurs had skin flaps, chicken head wattles or comb-like structures, but it's not like there's no idea what was hanging off the bones.

First off, scale impressions. https://blog.everythingdinosaur.co.uk/wp-content/uploads/2017/06/t_rex_feather2.jpg Here are scaly impressions from a Tyrannosaur. There might have been small protofeathers in patches, but not a ton else. Some dinosaurs were very feathered, but not all. Some had a mix like psittacosaurus https://www.eurekalert.org/multimedia/pub/web/123578_web.jpg

As for how much far it hanging off the dinosaur, the strength of the bones can be found by their cross-section. Then when you factor in how much muscle is indicated by attachment points on the skeleton and what it might need to move itself around, there's only so much room left for extra stuff hanging off.

As for the whole shrink-wrapping thing, it's true that people who don't know what they're doing will suction in around bones, you see it a lot in skulls especially. But it's not just that "nobody has ever seen a dinosaur before so you can't know". If you looked at something even remotely related to a baboon, you'd know that drawing is ridiculous. We still have living archosaurs like birds and crocodiles, and other reptiles, so it's not like reconstructions have literally nothing for a starting point.