You're right John.
Carries do have the potential to...carry...(I'm not trying to be jerk, sorry if I come across as condescending there)
That said, we've all seen games where a champion gets a little fed and dominates.
Irelia does it all the time. Jax is just as bad if not worse
...Akali...Lee Sin...Rengar...Riven...Shyvanna...Udyr...Xin...all these champions go carry mode if they get ahead (given not as hard as Irelia or Jax).
Even Corki, Kog, Ez and Graves do it...
So what's wrong with being able to carry if you do well?
I certainly don't think it is grounds to say "Fiora must have a bad kit, because she has the potential to carry."
People point at Nasus and say, "Nasus snowballs crazy hard and has crazy potential so he has a bad early game. Fiora deserves similar treatment." But look at Nasus' utility compared to Fiora.
Nasus provides his team with a good armor pen debuff, and WITHER is crazy crazy strong against any auto attacker.
(Not to mention Nasus gets tons and tons and tons of free damage from his ultimate and Q spam.) Those are things Nasus provides his team no matter how well or poorly he does. That makes Nasus an asset to the team inherently.
What does Fiora provide for utility? Nothing...absolutely nothing.
What I'm getting at is that a champion needs to be balanced at their face value...not their "what if" potential.
I'm not saying that each champion needs to be equal at every point of the game. That early game/late game gamble is a fun aspect of the game.
But justifying a champion being blatantly underpowered because they have the potential to carry if fed is a silly silly argument.
The simple fact of the matter is: Inherently, Fiora has a weak early game, a weak mid game, and a weak late game.
She has no place in competitive play. And that should really be fixed...