Juggernauts, what this argument is about, are slow and have predictable patterns.
Fiora is an agile fighter with the ability to block a part of the enemy's kit.
Due to predictable patterns, Fiora gets to pick and chose what part of their kit she nullifies.
And because they are slow, Fiora gets to pick and chose what fights, what trades she takes and what fights she doesn't take.
That's why Fiora crushes juggernauts in lane and later in split push. Its not because "omg stat checks", its just like in the Shen vs Sion clip from champion spot light. Its difficult for a juggernaut to actually use their skills on Fiora.
In a similar fashion. An adc has nothing to say to an Akali/Diana/Talon. They get to bully them till they hit level 6, then the ADC just dies.
Also, similar to this, most melee top laners can't do much to Teemo in top lane. Because he has range, and a blind and he is annoying. Hence hate. Same stuff its like if the enemy has a Nunu that invades your jungle. 1v1 you can't do anything to stop him. You can just watch him take your jungle and bully you around the map (unless your team collapses).
And in that case, not even Fiora can survive a 1v2 or 1v3 fight at lv 2 ("team collapsing on her").
I played Fiora vs Cho, went 11/0/8. I soloed him at lv6-7 without using my ult since I was already feed (my jungler ganked for me twice, so I snowballed). I'm not saying Fiora is weak. She has her powers.
But using tanks and juggernauts against her is a bad idea. As those are the type of heroes she can crush the moment she has an edge in front of them. If anything, her kit counters them... not by being "stat checks" but due the mobility she offers while doing %max hp true damage.
You can't "stat check" %max hp true damage. Coz it goes though your stats.
So, the only way to deal with Fiora, is to kill her.
Just as snowbally as she is when ahead. She has a hard time coming back from behind.
When behind, she's just a noob bait. Wanting people to toss all their spells on her when she Ws. But that's all she can do, while praying the enemy is incapable of ending the game before she gets on equal footing with everyone else.