The Trey videos are good. It's not really groundbreaking discussion though. Even 30 years ago every book I read on Dinosaurs explicitly stated there was little to go on as far as what skin coverings looked liked. Assumptions were made (and called out as such) based on reptiles obviously and we've learned much since then (like maybe many dinos were warm blooded, evolved into birds, etc). The idea of wide spread feathers was certainly not being discussed when I was a kid, but as Trey points out there is no direct fossil evidence that T-Rex had feathers either. The feather argument is entirely based on the fact that ancestors and relatives had feathers and therefore T-Rex must (or should). And that's fine, but how many feathers, where on the body and were they lost in maturity - it's all pure conjecture. No one knows.
The strongest argument in my mind against the idea of turkey rex is the fact that no fossil records show feathers. Yutyrannus fossil record show feathers - that's not debated - so it's not like fossil records for Rex wouldn't show feathers if they were there. Maybe T-Rex is a special case due to the quality/location of the fossil record, but that seems like a really loose explanation to me. Trey even makes an argument early in his video (intended to validate the idea of feathered T-Rex) that you can actually use to argue against the feathered T-Rex theory - namely that we have aquatic mammals today with only a handful of hairs remaining on their bodies. So they did essentially get rid of fur almost entirely. I realize T-Rex was land dwelling so there's less reason for that much evolutionary change (and a shorter time period), but T-Rex also evolved to be absolutely massive in size. Not that you can't have feathers on a massive creature - that isn't my argument - I'm simply pointing out there was extreme evolution happening in the world of the dinosaurs. You had a race of monsters that evolved. 10 ton meat eating land creatures is not normal. How big would those feathers be on one of those things fully grown? And if they existed, how is it we've not found a single one in the fossil record ?
I'm honestly not bent out of shape with the idea that T-Rex could have had feathers. Some of those illustrations of feathered Rex look sweet. But without direct evidence, Turkey-Rex is just as much of an assumption as Jurassic Park's Godzilla-Rex. The only conclusion we can draw is that T-Rex most likely had feathers at some point in it's life cycle. But we don't know more than that.