Totally agree. Except I didn't know DBNN are mainstream. That is, in research they're obviously well known, though I've personally not yet encountered industry

Totally agree. Except I didn't know DBNN are mainstream. That is, in research they're obviously well known, though I've personally not yet encountered industry settings (companies different from the tech unicorns, that is) that utilize them or even think about these problems. They often end up using the latest well-known architecture (like YOLO) in TensorFlow. That said, we mostly work with retailers and finance-insurance (non-US). Would be interested to know if your experience differs and in which industries.