I actually like Riot's idea to nerf the cooldown on W. People keep complaining that it's BS (despite the arguing for it before the rework) so I thought it would be a more popular change. Making clutch saves with it still feels great so there really is no problem with just cutting down on it's up-time to give opponents a wider window to hit back.
But seriously...have any of you guys seen Fiora's kit or played her even once???
"Let's just nerf her base damage, then we'll up her scaling to compensate so she's still encouraged to build AD but won't be able to build tank."
Have...Have you seen how low Fiora's base damage already is? Her Q has very low base damage and the AD scaling goes from "meh" at rank 1 to "actually pretty good" at rank 5, her W is a little bit of magic damage that only scales with AP (which she doesn't ever get since Triforce no longer gives a little), and her E is just two basic attacks with the crit back-loaded onto the second one being the most significant damage in her kit that isn't her passive - and Riot nerfed her base AD pretty hard with the rework to encourage her to build AD already so her basic attacks are nothing special.
The problem of "Tanky Fiora" isn't that she has such amazing base damage that she has no need to build damage...the problem is that most people seem unable to actually play glass cannon Fiora and not feed. Squishy melee DPS with low burst isn't exactly the most reliable role in League to start with. I watched everyone playing Fiora get wrecked super hard after the rework, and I saw people almost immediately say that the new Fiora required her to build defense to make up for no longer having her old ult and actually having to sit there in melee range for an extended period of time.
And lo and behold:

I have tried this build (in customs against bots since I'm not that mean) and it really is a stupidly good build. The damage actually isn't great, but the items alone make her incredibly hard to kill...and it really is the items alone since Fiora has no real defense outside of her 0.75 second W block. Just building that and being hard to kill meant that I could spam my low damage and eventually kill something - and when players are unable to play glass cannon Fiora successfully they will settle for that every time.
Nerfing base damage will only mean that glass cannon Fiora is hurt even more by falling even the tiniest bit behind. And buffing her scaling will only mean that the iffy amount of AD that bruiser Fiora builds will still be good enough to succeed. All it would do is make glass cannon Fiora even less popular and make Bruiser Fiora even more the default.
tl;dr - Fiora's base damage is already pathetic because Riot was afraid of her building tanky. Shame they have a bunch of items that give offense and defense and let bad Fiora players do it anyway. But nerfing her base damage further will only make glass cannon Fiora even harder to play and will make tanky, bruiser Fiora the only way to play Fiora.