Thanks for making that point. It still seems to me that most domain specific solutions will still make use of many ideas from the CV literature. E.g. looking at the last sections of your video it seems like you settled on a histogram based approach, although I may be wrong.
I think you get a bag of tricks as you work on this stuff, for sure. But I think they are more like the tricks artisans gather, share and re-use than fundamental academic truths.