This is the reason film did not die and a fair number of photographer are still using it , for SOME purposes.
Images
The resolution of a digital sensor is measured by the number of pixels they contain, while the resolution of film is measured in “angular resolution”. The resolution of 35mm film is 4K or higher. To scan most of the detail on a 35mm photo, you'll need about 87 Megapixels. However, each film pixel represents true R, G and B data, not the softer Bayer interpolated data from digital camera sensors. A single-chip 87 MP digital camera still couldn't see details as fine as a piece of 35mm film. If we were to put a 120mm negative against a 35mm full-frame digital sensor, the film’s resolution would trump the digital camera.
ExpertPhotography
IF, what your son did, only with film, he would need more people, or have to shop out to a film developing and print lab and spend even more hours on a shoot, with no easy way of know if the shot was good or needed a redo.( Decades back , although not as many as some think, Polaroid backs for 35mm cameras, gave photographer a quick way to check out some shots, before shooting film)
I have done both color and black&white dark room work.
It is a LOT of work, especially in color as color is done in Total darkness.
A fair number of the processes are similar, beyond developing but your son or his compatriots do with a computer, mouse and screen what would take hours of footwork labor with film. (Now there are auomated developing machineses, that are far, far easier and quicker than the one man do it by hand days)
For those who want film and paper printing (with an enlarger and no scanner); many have to do it them selves as labs that print without a scanner are getting to be few and far between.
I do not know how many of the special films for lab work, reversal film and such ,still are around, but at least right now, if is far from dead.
The Nikon D6 digital cameras still had some analog manual functions for pros who wanted them but I do not think any of the new no mechanical shutter less digital cameras do.
The very best lenses, some from he fifties, such as Kinoptic, have never been exceeded, while they no longer are being developed for utmost speed and sharpness. (Over the counter lenes, not NASA or such specialty items.)
The best lenses are sharper than the finest film and digital sensors can handle less than film, plus a lot of work is done in a computer lab with computers analysing changing an image to what the users want, so eceptioanally sharp lenses of the past are becoming a rarer beast.
Prbably worse is that the new lenses built for mirrorless cameras, have zero analog functions, there is no they work is the camera computer goes on the blitz.
With film the old no photometer trick was, ASA at F16, which in daylight often saved the day.
NOW digita photo labs , at times, CAN save or technically fix bad photos, which many photographic people should fall on their knees and thank God, for; this is especially a way to save over a century old photographs without a negative , or scan a bad negative and make adjustment.