Yasuo's Dash

So I just wanted to bring up a quick point that I find highly unfair with Yasuo's dash. His dash will dash through an opponent, making him immune to opponents skills for the duration. For the best example I can give, as Gragas, I Body Slam towards Yasuo. Yasuo instead of dodging, just dashes at me, his dash goes through me, and he takes no damage from body slam. This is just ridiculous. There is no real counter-play to this. Dashing should not make Yasuo immune to line projectiles or body's heading towards him during his dash.