I would agree that Yasuo has advantage REALLY early but Fiora's power curve ramps up over time and over takes yasuo at 6 if you never let him knock you up + ult.
But if your jungle doesn't need wolves you can show up to lane with 5 health pots and negate any early game advantage he would have otherwise had.
Now I am that jerk as Fiora who goes "Brusier" after my core items to make sure "Clutch plays" on behalf of the yasuo has no chance to kill me and to have a better team fight.
As I have noticed as Fiora and fighting Fiora if she goes Hydra > BC > Glass builds they die really hard in team fights, I rather have Spirit visage and Deadman's plate to be very hard to kill and rely on the % true damag to kill everyone instead of building LW.
(however I am ALSO that jerk that builds Trinity force with CDR runes if the enemy team is light on AP damage.)