Nice video recap, as usual, Darren!
Your comments on the ZEN12 in your garage closely parallels my Beta unit installed next to the door entering our home office. It quickly recognizes one of us has entered the office and, if the lux level is below threshold, immediately turns on the ceiling lights. As you noted when sitting still at your workbench, our lights also time out if we’re sitting still at the desk. This is to be expected with PIR sensors and I’m looking forward to the day when I can combine a PIR sensor with an Occupancy Sensor (probably mmWave): quickly turn on with PIR and turn off only after room occupancy goes away for some period of time.
The “bouncing lux sensor” comments are also interesting and reinforce many of my thoughts on the matter. I’m sure you saw the discussion on Adaptive lux Level Reporting, which explores the topic in more detail. Wouldn’t it be nice if lux sensor devices could be “tamed” with, say, a low pass filter to cause fewer reports? IMHO, it would still be a useful relative illumination number, albeit with a “settling time” before drastic changes occur. For some applications, that would be ideal–others, perhaps, might need the instantaneous report frequency. Choice is good. 
Overall, I heartily agree: the ZEN12 Motion Dimmer is a very impressive device. 