[%c_effect d5;square;d5;type;GreatFind;persistent;true] This is the point. White would prefer to keep queens on the board, so Black's move is unpleasant to face.
1. e2e4  1... c7c6  2. g1f3  2... d7d5  3. b1c3  3... c8g4  4. h2h3  4... g4f3  5. d1f3  5... e7e6  6. d2d4 White has many alternatives here. 6... d5e4  7. c3e4 A pawn sacrifice that is suitable for blitz but maybe not for a game in classical control. 7... b8d7  8. f1d3  8... g8f6  9. c2c3  9... f6e4  10. d3e4  10... d7f6  11. e4c2 