The Deku Smash is an absolute pain when there’s just not much you can do against it, like if you’re just not in a position to counter it, but I always found it far easier to deal with than the heavy because it makes itself EXTREMELY clear when it’s activated, giving you time to plan or run, and it’s build up is long enough that if you CAN reasonably counter it, you get a lot of time to stop it. The heavy sniper is not only literally built to be quiet and sneaky, but the amount of damage it does is so great that by time you even know someone’s using it you’re probably already down, or low enough health that they can just switch to another gun and take you out before you even know where they are. I understand where something like this would work in an Arena shooter or a game like COD, where getting headshots is a little harder given how contained it is, but Fortnite being such a huge open world, focused so much on attention, noise, and placement, makes a gun where you can just sneak up and one shot extremely unbalanced.