Problem with speculating about feathered dinosaurs is that where are the feathers?
We are all familiar with how soft the tip of a feather is, no one would expect that to fossilize all that well.
But the quill part of a feather is a HARD substance. I think chemically, it’s got a lot in common with stuff like fingernails.
If there were big dinos with big feathers who were fighting and ripping each other apart, we should reasonably expect to find bushels of fossilized feathers - dump trucks full!!
Plus, over the course of their lifetimes, they would shed them, so we should find way more fossilized feathers than fully intact, articulated skeletons.
You make a good point, though I’m not as certatin as you that feathers would fossilize. Impressions of the feathers have been found, however.
Keratin, the substance that makes up feathers, fingernails and hair, seems to fossilize if it is sizable. Neither feathers or hair are ‘chunky’ like the claws of large dinosaurs which do fossilize.
Also, and this is germaine to your position, dinosaurs died out a long, long time ago. The amount of fossilized remains is actually quite limited; in fact, a ‘complete’ fossilized skeleton of a T-rex has never been found - something is always missing! Thus finding fossilized feathers may be impossible due to the fagility of the item and the length of time that has passed.