because even shitty film pictures look better than digital ones.
Phone snapshits oversharpen and oversaturate the fuck out of images, and then aggressively remove noise and replace it with jpeg artifacting and haloing.
DLSR/Mirrorless cameras produce technically perfect images that lack soul or warmth and generally make you less happy to take pictures.
With film, you don't get the disappointment of looking at an image and seeing just how badly you fucked up exposure or whatever. The emphasis is on taking pictures, not getting "perfect" pictures. Thus, you also allow yourself the ability be creative and free yourself from the cycle of
a) take a picture of something you think is cool
b) look at picture, decide it doesn't look as good as you wanted
c) retake the picture with nearly the same settings and composition
d) repeat b and c ad infinitum
Once you remove the reshoot aspect, you can focus more on being present about your photography and your art.