Bidding 2C after 1M-1N with 5332 playing forcing NT is not unknown in NA I promise
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I used to play that when I played forcing NT, and many experts play it here. It seems clearly better to me, especially if you play bart. I still think passing is best
Opening 1C on all balanced hands is less common, but it is becoming more popular among top experts especially with transfer responses to 1C becoming more popular. I think it's clear that opening 1C on all balanced hands is better if for no other reason than that you have a better system over 1C. It might make competitive auctions harder though, a la precision 1D, but obviously your competitive auctions when you open 1D will be much better and all constructive auctions will be better. Outside of top players I agree that this concept is not well known, and even most top players do not play it still, I'm not sure why!
Bidding 2C over 1M with all balanced hands is pretty much competely expert standard now and many non experts know it as well.
Your point about 5332 with 14 is a good one, it is why Bob Hamman has always included many 14s into his NT range. The theory is just to open 1N with a 5 card major and 14 unless your hand is terrible, and if your hand is that terrible then you can miss 25 HCP games and feel ok about it.
*Side tangent but another problem with 14 is that it's basically a GF opposite a competitive 2/1, but you cant really cuebid or jump to 3N with it. I think having non bad 14s in your range cause a lot of problems in general.*
Most people who play semi forcing NT will bid over 1N with 13-14 balanced because they're willing to accept an invite.
I think this is not good since a 5332 14 cannot accept an invite really on an auction like 1S-1N-2D-3D (if you bid 2D with that like most people do). With 13 I'm happy to play 1N.
My style is really only playable if your NT range includes 14s with 5card majors, and you open 1N with stronger 5332s, and you play invitational jump shifts over 1M (as mickyb alluded to), so that you arent bidding 1N with like 6 hearts and 10, I think it's good but it's not standard at all... all in the name of playing 1N a lot and rebidding 4 card minors
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As you can tell I hate rebidding 2/3 card minors. Since everything fits well for me (I like to open 1N aggressively, I like to play inv jump shifts anyways because I hate bergen and stuff like it, I like to play 1N/not get too high on invitations getting passed/I like to open light), it works ok for me.
If I didn't play invitational jump shifts or opening 1N with 5332 14s, I would still rather play traditional semi forcing 1N (bid with 13-14 5332, pass with 11-12 5332). This is not that different from forcing NT, it just means you pass occasionally, and I feel like passing with 5332 11-12 will still be a winner.
Finally, you could just play like jdonn and play foricng NT but pass sometimes (as far as I can tell jdonn bids with a 5332 11 if he thinks its suit oriented, he only passes on scattered values and balanced and min or something). This just assumes you don't bid 1N with GF hands ever.
By the way, this forum should not be your guide to what experts in NA know/play. Most of the people who post here frequently are not very good and don't know that much and don't play that much in real life. Not criticizing/aimed at anyone obv, I just mean you shouldn't base your entire assumptions of NA on this forum!