it is striking that people have such a misapprehension of the resolution of 35mm film
I agree with you. I've recently become a film nut, but I agree that modern high-end digital outperforms film hands down. That said, film is still
great but a lot of people still think very poorly of it.
My suspicion is that in the time before digital and everyone shot on film, most people were just really bad at taking photos ~ people used 35mm point-and-shoot, disposable cameras, 110 cameras, and similar. The general population weren't photographers and weren't using film to it's full potential - as a result, they got tons and tons of bad photos. Modern digital cameras (including those in phones) have great auto features for proper exposure, etc... and it's easy to delete bad photos (out of focus, too dark, etc...). I'm inclined to believe that most people's poor opinion of film is conflating the medium (film vs digital) with the camera experience (manual & confusing vs automagic).
There was recently a post here on HN about how the internet killed bad photos [1]. I made a similar comment at the time [2].
[1] https://news.ycombinator.com/item?id=28987554
[2] https://news.ycombinator.com/item?id=28989625