Why doesn't everyone play 1.Nc3

I'd guess because a stronger player can force a advantage position for black before it can get into a Queens gambit declined. stronger players are adept at transposing

I'd guess because a stronger player can force a advantage position for black before it can get into a Queens gambit declined. stronger players are adept at transposing

 I would think because, in master games, it has a 34 percent win rate for white, a 25 percent draw rate, and a 41 percent win rate for black.

it`s because the c pawn being blocked makes it hard to enter queens pawn openings

I think the problem is that black can play any move against it. This means white has to prepare for a bunch of openings+variations+subvariations which is pretty time consuming. 

As you can see in the diagram black has so many first moves to choose from. And even after those moves black can choose different variations. White will probably just push one central pawn to transpose into another opening.

I'm not an expert of that opening so I can't say whether there are some tricks here for example move order tricks or something or whether there are some independent liens.

Its just because they were waiting you to ask this question.

1.Nc3 Nf6 probably. It's hard not to transpose into something else.

This.

There's a good and very entertaining book about the opening by Harald Keilhack, which persuaded me to play it for a while. The trouble is that the main line just looks very good for Black: