i beeelieve i read somehwere that 35mm film is comparable to 4k raw storage. 4k raw storage is a lot of data, and until recently you couldnt really store that kind of data and move it quickly around... you know what is portable though? 35mm film. its incredibly information dense, despite being analog and is ancient compared to new film-less recording systems.
film is still an efficient way to store quality data.
that said, i may be out of date and its days might not only be numbered, but over