Why does film photography always give people the impression of small depth of field and more noise?

This has something to do with movies. Dozens of sheets in a barrel can only be an Iso value. Professionals and amateurs generally buy 400,800 yuan. Development is a chemical reaction of silver salt, and there will be some noise, but this is the charm of the film, and its layering digital can't be done. Small depth of field is not common. In digital photography, many landscape photos are actually taken from different focuses and then post-produced, which is a routine that almost all professional landscape photographers are playing now.