This is not the only position in which this tactic will appear. There are many other variations which involve this equalization trick for Black. For example, consider the moves 1.e4 d6 2.d4 Nf6 3.Nc3 g6 4.Be2 Bg7 5.h4 c5! After White's forced 6.dxc5 (6.Nf3 Qa5!) Qa5! 7.Bd3 Qxc5, again with a much better pawn structure. Black can get this dominant, healthy pawn structure in many Pirc variations. Certainly the Black pawns are better than the White pawns. Black has strong pressure on White's e-pawn. Meanwhile, White has weakened his kingside with his now-useless move 5.h4. The point of this move was to play 6.h5, creating a weakness in the Black kingside, but now the g3 and g4 squares are weakened, and it is White's position that gets the weakness.