According to Nash charts we should be pushing hands like QTo, only 20+ bbs deep.

If so, is it incorrect to jam 5bbs ? If is incorrect what should i do with QTo 5 bbs ?

yeah QTo on 5bb is a push.

btw I believe that most of the players stop using nash charts few years ago.

Why ?

cuz u can get more value playing hands like QTo on 20bb postflop. I belive that atm playing huht is more about playing postflop than ai/fold decision

You should re-read the FAQ explaining how the charts work. The numbers are the minimum stack depth, not maximum. So it says you can shove it once you have < 20+bb if you're playing push/fold. The + is just because the number is higher than 20bb, but they didn't bother right it because playing push/fold deep is awful. So if a hand has 13bb it means that if you're playing push/fold, pushing > open-folding 13bb and all shallower depths.

People still use Nash charts. They're still really useful. It's just that they model pure push/fold play, which applies only very shallow. The SB chart starts getting really useful ~5-6bb and shallower, and the BB chart is good starting ~8bb and shallower (though that's villain dependent).

Thanks a lot