Take the opening move 1.d5-d8, on the face of it black has four natural looking responses: 1....d1-d5, 1....d1-d7, 1....e8-g8 and 1....f9-f8, in reply to any of these except 1....d1-d5 white can play 2.e5-d5 threatening an immediate draw by repetition. I dont know if the draw can conclusively be defended but in any case this typifies an opening situation in which black is struggling to avoid the draw never mind trying to win. If it turns out that black can only prevent the draw by choosing 1....d1-d5 the number of possible styles of subsequent middlegame is enormously reduced, something that I cant see as being good for the game.