I really like how analytical you are towards everything in here Robb. I recently had a little foray into the micro HUSNGs during one attempt to build a roll and while my experience with HU cash is quite limited the differences that you pointed out are pretty significant. I also fully agree with what Max posted on SA about stationing and how a lot of HU cash players can't grasp this.

If you think about it in terms of combos there are just so many ways to miss a flop so even a middling pair with an okay kicker can be in the top 10-20% of your range in a given hand. Furthermore, because stacks are so shallow and get shallower as the game goes along ranges get weaker and weaker and the incentive to take down every pot rises. Due to this you can feel pretty safe in making calls that would be ridiculously thin or even massively -EV in a HU cash game.

The micro HUSnGs are pretty entertaining and you'll see some absurdly unorthodox plays but from what I gathered they are easily beatable if you almost never bluff as everyone's hands become very face up on the later streets.