Okay I found Fiora's problem
It's the fact her passive is up so damn often combined with her not being able to be CC'd during her dash. Her passive has almost 0 downtime. And the dash anti-CC is a bug. Let's not forget about her low mana costs too.
Also lets not forget how she has an immunity in her kit that can also relfect CC.
So did someone on the balance team just not think at all that her kit is extremely loaded when they make her or did they just go we need to make Fiora be the only lane bully that scales into late game in top lane that has a support like ult. But don't worry guys we have the solution. We just hit her base stats slightly that ought to fix her real problems.
How to fix her. Vitals now have a CD of 3s per champion on proc. The MS boost is now halved (as she should already be able to chase you with her cheap Qs) except during her ult. The AS slow on Riposte is removed and the cast now lasts .5s. Duelist dance heals 20->10+5->6 per level up.
The other route is to make parry cost 60 mana and her Q to start at 25 mana and scale the same and have the CDR 60->40% along with her passive having a CD of 3s upon hitting a mark. Also mana pool 300->280.
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have been nerfed time and time again. Riot has said skill cap should have no influence on a champs viability. Every champ should be relatively equal regardless of skill level. Higher skill cap people on the other hand can have a tiny bit more power, but only if it is really hard to obtain that power and there is counter play to avoid it as well.
both have 50% win rate.