The dash itself is instant, but his hitbox is elongated during it which means he eats all of the damage regardless. It’s cringe.
I digress, I still more or less agree with you because if enemies are on alert and I have no space, I just launch my Spirit Bomb virus at them and immediately translocate away just to create pressure. She is not super lethal off of her engagements unless they are distracted whereas Genji can just brute force a fight and win.