It's a bit strange that top players never open 1. f4. I mean, Nakamura frequently plays the Dutch, Radjabov often plays the Schliemann, both with an early f5, and Carlsen has even won with the King's Gambit in a top tournament, as well as with 1. a4 in a World Championship game (...)
The Dutch and the Schliemann are perfectly fine openings (if maybe a bit crazy). The fact that they are played regularly, unlike the Bird, is a good pointer that GMs consider it as worse than those two. They do not look the same as the Bird at all (apart from the fact the f pawn is pushed two squares, but that doesn't mean much).
And Carlsen's 1.a4 (if sourced) is pure trolling from him.
and still i believe there was a danish GM who won the danish open a few years back, who said in a new in chess interview he played f4 because he is too lazy to keep up with opening theory
I play the Nimzo, and I'm always aiming for that setup. You can definitely play the Classical Bird like a reversed Nimzo (or QID) just like the Lenningrad can be a reversed KID. You already played the fpawn out, so you have extra control of e5 from the get-go. I don't know any reason to call that setup with Qb6 a "Rubenstein", or the line that follows a "trap", but maybe I'm missing something.
i am sorry it s not rubenstein ther is a varition in the dutch rubenstein i git them mixed up