I don’t know the answer to your question, but I have been told the same thing as BIM says, one BB and one super. However, I have been running a two deep (since I didn’t know any better), and the colony is thriving and has been for several years. The last time I looked into the bottom box, it was just full of dark empty combs and a few SHBs. I close the SBB on cold nights and vent the top during the hot-hots, and I have a screen over my inner top to keep the bugs out.
IMO, bees adapt readily to what is available, from hollow trees to in-ground meter boxes. Most conversation is about optimizing production and that is not my concern since I get more Honey than I can use. I put a second medium super on once and my bees showed no interest, so I took it back off. I’m pretty sure the idea is to give them space they need but not too much for them to manage.
I would speculate that colonies in Florida (mine are feral mutts) do not build large numbers because of weather conditions and dearth, so a single brood deep enables them to be more efficient. Mine have never swarmed or bearded, perhaps because of the second BB. I do have a swarm trap nearby where, before I kept bees, I had a swarm move into a bird house, yet alas no luck. If your bees are busy, they are happy and you can’t help them much, and if they are happy, they’re not going anywhere.