What kinds of doctors, that you interacted with: Your GP? Those seen on TV who work in media roles? None of those are the researchers.
I'm not in the USA, I got onto masks quite early. But I think that we still lag badly in anti-covid ventilation systems, while still over-emphasising hand-washing.
Some of the best people on the topic (of our evolving understanding of COVID, not of Scotsmen) have in fact been relative outsiders (i.e. neither medical researchers nor crazed conspiracists). I'm thinking particularly of Zeynep Tufekci on Airborne transmission, e.g.
https://www.theatlantic.com/health/archive/2020/07/why-arent... https://sils.unc.edu/news/2021/tufekci-lancet