While I agree that actual act of using a flamethrower takes no skill. (Holding 2 buttons down). The getting close enough to burn 2-3 people to make the flame thrower an effective purchasable takes a lot of skill as a stealthy player being you burn someone once with the flamethrower and most people tend to try to keep their distance.
actually a quick blast from the flamethrower won't kill you. It will only injure you, maybe from the start of the cone, but not in regular close quarters. If you pay attention to your health when getting attacked by a flamethrower it just cuts your health down in increments, albeit really quickly, but it doesn't instantly kill you.
can't that be said about anything if you generalize it to holding 2 buttons down?
I mean literally all you do in this game or any game is press buttions, pressing buttons doesn't take skill.
If that were true then everyone would get headshots 100% of the time. Flamethrower takes no real aim. Point in someone's general direction and hold down the buttons. Maybe swipe your control stick back and forth to follow the movement of a player (if they have armor on)
But aiming does take skill and practice. That and teamwork is what separates the good players from the bad/new players.