Why would someone not play the Nimzo-Indian?

Statistically, it is the best opening against 1d4.

It could be avoided with 3Nf3, but even if it is, the alternatives (Queen's Indian, Queen's Gambit) aren't bad.

So, why would someone, playing Black against 1 d4, not play the Nimzo-Indian?  Are there certain drawbacks to the Nimzo-Indian as Black other than that it could be avoided?

When someone dodges the Nimzo, I head for the QGD with d5. Once they show they're afraid of something, they reveal how weak they are.

Question clarified to remove ambiguous language.

because they don't like the positions it gives?

^ Thanks.  Please elaborate.  What about those positions do some players not like?

I am a decent player who decides to avoid the Nimzo with 3. Nf3. The reason is that there is a ton of theory in the Nimzo and I have chosen not to learn it. I am familiar with many of the types of positions that arise and aren't afraid to play them but why give Black the chance to play an opening that they probably know better than i do? One must know the lines that occur after ...d5, ...c5, ...b6 and so on and each of these have their own character. I have dedicated my studies to the Queens Gambit, King's Indian, Benoni/Benko, etc... it would be just too much to handle such a topical line as the Nimzo. 

Thanks.

I am asking why Black (not White) might choose not to play the Nimzo-Indian

For the exact same reason, you need to know alot to play it. White can respond with Qc2, f3, Bg5, g2, a3, etc... each with their own character. Also, giving white the bishop pair so easily can be risky, so you must be sure you know how to play those types of positions.

While the Queen's Indian is certainly a good opening, the type of play and it's positions may not be appealing for a Nimzo-Indian player.

Mr. gun, what is the best first move with White, 'statistically'?

Why do you assume that everyone know the Nimzo-Indian?

The answer is because I don't know what the hell is "The Nimzo-Indian Defense."

So play the Budapest Defense.!

That.

Plus, "best move statistically" does not mean much. In master databases 1.e4 e5 2.Qh5 scores very good for White, but the reason is that only Nakamura plays it against weak opposition.

Statisitics not everything, or even the most important thing about choosing an opening. Gave up Nimzo because a lot to learn, both in Nimzo lines itself, and in whatever combine with it against 3Nf3. Plus after 2...e6 the lines where white avoids c4 are quite awkward for black to deal with. At the time also found it difficult to find a fun line against classical Qc2, which is popular with club players keen to avoid double pawns. For me KingsIndian gave more flexibility to play ambitously against lower rated players who needed to be dugout of their stody lines.

At the top levels the Nimzo-Indian isn't as safe and sound as club players tend to think. In nearly all world championship matches black comes under pressure. Funnily enough usually in the double pawns but bishop pair lines, the 1.d4 club player carefully avoiding. Even in last worldchampionship match the Nimzo game was only one Carlsen under serious pressure. 

Both the Budapest and Nimzo-Indian can be avoided if White plays 2. Nf3. Probably another reason why spending too much time studying one single opening won't be that fruitful.

agreed, i dislike the nimzo-Indian, i never play it, if people like it, that's cool, but i don't get why it is the rage.

Why doesn't everyone play 1.d4 because top level engines think its best?

   Why don't you show us a diagram of the openning?

                         Maybe we'll like it!

Here you go Denver. Why don't you play this opening?

        I would love to play her opening!

Still, no one answers the fundamental question: why doesn't everyone play 1:d4??????