There is some small truth to this - at least for image acquisition. The bayer filters in modern digital sensors are way to broadband, which perhaps counterintuitively reduces saturation, but more importantly reduces color accuracy from human perspective. This is especially apparent in the green-red spectrum.
The sensitivity curves of Kodachrome 64 and presumably 35mm film stock much more closely match CIE 1931 effective bandpass curves and results in much more accurate color.
However, most this can easily be fixed in post with modern tools. Almost all of what you are seeing today is artifacts of the Director/cinematographer/editor's artistic choices and not the acquisition tech.
They're not as valuable as you might think. LL.com's go for >$1M but LL.org's and LL.net's are in the $10K-$50K range.
I missed registering kl.com by a few weeks and had to settle for kl.net. This was back 1995 when you had to email a template to Internic and wait about three weeks for a reply. In the template you had to provide working nameservers. I had put down some random hostnames for nameservers since I wasn't running my own yet and it was rejected after the usual three week delay. By the time I had nameservers set up a few weeks later a law firm had registered kl.com.
With working nameservers I was able to register maj.com (have since sold it) and finally kl.net which I plan to keep til I die.
The sensitivity curves of Kodachrome 64 and presumably 35mm film stock much more closely match CIE 1931 effective bandpass curves and results in much more accurate color.
However, most this can easily be fixed in post with modern tools. Almost all of what you are seeing today is artifacts of the Director/cinematographer/editor's artistic choices and not the acquisition tech.