Much obliged to both of you, thank you.
I was fortunate while researching this topic to run across this page early, which explicitly calls out the NT-2a in the Mid-Side section at the end. This reinforced grawk's early response of not needing a stereo bar and just playing with mic placement, so I opted not to get a stereo bar, as I do have a boom floor stand as well as a boom desk stand, so I should be able to experiment with exactly that...once I clean up a little bit. (Kinda hard to put both in the same place, currently.)
But it always helps to hear the explanation multiple times in multiple different ways, so I really do appreciate the conciseness of that video. I'm pretty strong in math and DSP, so I didn't really have much trouble wrapping my head around the concept, but I have to wonder how they figured this out in the early days (pre-DAW). Probably just some really smart people who were into music and music making.