My doctors have been incredible, at least those I’ve had for the past 4 years or so. Including my gastro.
They take the time to talk to me, they remember who I am, and my gastro is even a direct recommendation from my primary doctor (my gastro is his gastro).
I’ve been going to gastroenterologists for literally decades, the one I got a couple years ago is the first to finally find the issue, and I’ve been reflux free. I doubt he’d do a transnasal either - its more limited in scope (hah!), you’re only getting part of what an endoscopy can do. That’s why its not transnasal endoscopy, its transnasal esophagoscopy.
And that’s probably why. Why they wouldn’t just say that, I don’t know. There are lots of places that will do transnasal esophagoscopy throughout the US, so it isn’t a procedure that is just “not done here” or anything, its not as popular in general because its just not as thorough of a procedure.
I hope you find a doctor in the future that takes the time to explain things though.
Edit: Forgot to mention, the hospital system by me is a non profit. Only differentiator I am aware of, and its a great hospital system.