There are many possible reasons for why the experts aren't using it. Assuming that the reason must be "because it's broken" is illogical by definition.
Ignoring hundreds of posts on an issue and just taking one piece of evidence alone and saying that one piece of evidence alone isn't enough to prove the point is illogical. This is exactly the sort of strategy the tobacco industry used for years to fight the truth. Dispute all facts in isolation. Postulate highly unlikely but not impossible alternatives. Make extensive use of Argumentum Ad Hominem. This is what we are constantly seeing from your side of this "debate".
I think that you have faulsely identified my argument as a straw man argument because I added in extra details which you are unwilling or unable to provide but your fellow "2/3 isn't broken and the earth is flat" teammates have discussed. You merely stated possibility that:
the BBs didn't use 2-3 because there is an insufficient number of players in the BB-verse trained to excel in 2-3.
Yes so even in the NBBA, in fact in the whole game there aren't good enough players to make the 2/3 zone work. So it isn't broken, just no-one anywhere has good enough players to make it work.
Please explain how this isn't broken?
Seeing as I have already been labelled as using ridicule as a tactic I may as well continue.
The details I got from one of your buddies who had it revealed to him by an old Gypsy during a seance that you need players with great inside defence (the number 14 was mentioned, and it has to also be raining fish), equally good outside defence (no number was mentioned but I think we know what equal was, however the game must be played at midnight during the winter solstace) and when some people said that they actually did have players that good (incredibly rare) there was a further revelation made from deducing the meanings of crop circles that you also need equally good shot blocking (and to sacrifice a goat).
A man to man works with any player. You can run a 3-2 with guys with respectable OD and it does what it is supposed to and cuts down outside shots. A 1-3-1 needs a good center and then it does what it is supposed to. FCP does get a lot of steals but it does give up a probably unreasonable number of offensive rebounds but it doesn't need any magic players, just better defenders than the opponent has handlers and pasers. 2/3 needs players that even you admit don't exist in the BB-Verse to work. Broken!