In Fortnite, item drops and the glowing chests very game by game. If you drop in the same place twice in a row, the chances of getting the same quality of items is vastly different. Yes, they could control that in competitive games, but Fortnite has not done so even in competitive games as they rely on running a best of X instead using a point system in attempt to minimize the effects of the randomization.

Plus, because you can drop anywhere, it's possible that some players fight sooner than others, creating yet another source of luck that can not be controlled. And yes, this could be controlled too, but again, Fortnite has not done so as it could result in removing one of the core aspects of the game.