It's useful information about industrial machine vision cams, since I don't have any experience with them. You are right about custom cameras - in fact, I have

It's useful information about industrial machine vision cams, since I don't have any experience with them. You are right about custom cameras - in fact, I have some camera modules for experimenting with surveillance, night vision and machine learning, and some of their datasheets mention registers that, when set, output Bayer format images. Machine learning in surveillance is still a rather under-serviced market, but it's potentially a rich source of raw image datasets. Raw format training and inference definitely work. The obstacle is only data availability.