T-Rex with feathers looks just like a giant chicken. Chickens aren't exactly awe inspiring so I think that is part of it.
Chickens do ruthlessly hunt mice and other small things so a giant chicken would be really scary, just that our minds don't see them that way. But I can easily see raptors and t-rexes being just giant versions of our chickens with similar feathers, they are so similar in all other aspects.
Although there were larger raptors, velociraptor was about the size of a turkey--which is indeed one of its closest modern relatives. It got super-sized for Jurassic Park. And I know dinosaur in the general public's eyes conjures up T-Rex and Brontosaurus. But scientists were well aware that the majority of dinosaurs were a lot smaller.
But I don't disagree in general that there were a lot of factors that set the orthodoxy in place. Including that there were large (and flying) reptiles.
And I think they haven’t used the largest known dromaeosaurid, the Utahraptor, in any Jurassic Park/World movie, have they? A 7 meter long “velociraptor” sounds terryfing, but I guess at that point they rather go with the larger theropods.
Honestly if you've ever been in the middle of a group of wild Tom turkeys in the spring, I don't think that's any less scary.
Turkeys are dumb as hell. So they're not really a threat. But they're super aggressive (or can be) and if they had teeth and larger claws and especially if they were pack hunters, it wouldn't be great
The most recent consensus is that T. Rex probably wasn’t covered in feathers.
Based on an analysis of skin impressions and the likelihood that feathers would have caused such a large animal to overheat in the climate they lived in.
Chickens do ruthlessly hunt mice and other small things so a giant chicken would be really scary, just that our minds don't see them that way. But I can easily see raptors and t-rexes being just giant versions of our chickens with similar feathers, they are so similar in all other aspects.