silvr bull, on 2017-February-04, 23:57, said:
Another strong value of 12-14 NT openings is that it makes life difficult and risky for the opps (as shown in this thread) and easy for responder to know what to do. Opening 1m to rebid 1 NT with 12-14 balanced, in contrast, makes it easy for the opps to overcall, and difficult for partner to know what to do until opener can clarify his hand description.
It is often written/said that a 1NT preempts both sides. The upside is above, the downside is when we play 1NT and the strong NTers have an auction like 1m - 1M; 2M - P. There are also effects on the other side of the coin too, with the SNT hands sometimes being a little awkward in competitive auctions. I think this last effect is the reason the SNT has generally won out in natural systems, even when I have personally always played WNT systems (Acol, strong club) and prefer them.
silvr bull, on 2017-February-04, 23:57, said:
I see no more reason to alert responder's pass (after a 12-14 NT open) as showing some values than to alert that I am more or less sane when I sit down to the table. Just as I would not pass with xxxx xxx xxx xxx after a 15-17 NT open (an automatic 2C takeout before LHO can double), I would not pass a 12-14 NT open with xxxx Qxx xxx Jxx. Getting out of 1 NT before the double is an obvious part of the game.
How about x xxxx xxxx xxxx or xxxx x xxxx xxxx though? I think the vast majority of weak NTers (and SNTers for that matter) would pass this and use their runout system after being doubled but it sounds as though ggwhiz was playing (or playing against) systems where this was an automatic response.