I wouldn't say GUTTED. More like... "Brought in Line". Now, as for the why? There are already ten billion (or what it feels like ten billion) explanations as for why the two are out of line. I would hope we've all seen and heard them enough (From both Top-laners like myself and others) that I wouldn't need to reiterate them here for the ten-billion-and-oneth time.
But, I know, we all have SELECTIVE memory, so I guess I'll say it again.
For Riven, (Based on MY Experience, this is just MY feelings) it's the fact that she is able to stack the updated form of Conqueror extremely quickly, if the Riven play knows what they're doing with the champion. Her Q, if I'm not mistaken, gives 3 stacks by itself or more if they weave AAs in between each Q use. If I'm wrong on that feel free to correct me.
In addition to that, the fact that she is healed for 10% of the pre-mitigation damage dealt allows her to circumvent her previous weakness of having no TRUE sustain (What I consider TRUE sustain is in-combat heals akin to what Juggernauts have) aside from her E shield, since her HP/5 is crap by itself.
Then, add in the NIGHTMARE of a design that is Spear of Shojin
. Because Riot refuses to give up on that "Awakened Dragon" effect, she can basically render the CDs for her abilities (Already made low enough with the 40 to 45% CD reduction every Riven builds in their kit and runes) to be essentially non-existent. Weave enough AA's between attacks and abilities and she can, theoretically, stun-lock you permanently if she uses her Q's knockup CC and W stun correctly. I say theoretically because I would think that even the most professional Riven player would not be able to do that consistently; they're human like the rest of us after all.
I fully realize that Spear of Shojin is NOT an problematic item that is EXCLUSIVE to Riven, but it DOES add more problems to her on top of what she already had with the new Conqueror.
Now, on to Vayne.
IMPO (In my personal opinion) Vayne was doing her job well enough without the 50% reduced cool-down buff on her R she got back in the 9.1 patch. Then, the fact that
allows her to bypass the 3-hit requirement for her Silver Bolts was basically like giving me a paper cut and pouring lemon juice on it!
She was already able to melt Tanks and Juggernauts with the True Damage. So you should build Armor since you can't build Health against her, right? Nope! Guinsoo's also gives Total Armor-Pen! (Yes I know, it is based upon level, but it nonetheless exists) On top of the Last Whisper item (
or
, take your pick) she is sure to have built.
So, the two things that you are supposed to build to counter the things she offers, Physical Damage and True Damage, which are supposed to be counter-built via Armor and Health respectively, she renders BOTH of them moot! Her True Damage allows her to bypass high armor, and the Max HP% OF that True Damage allows her to bypass high health!
A Riven, for the most part, you CAN Itemize against, as Conqueror, once fully stacked, only converts 10% of her damage to true damage, AND it converts the damage before damage modifiers. This makes both damage increases and damage reductions be 10% less effective. She will deal the same amount of true damage with or without damage modifiers. So, while she WILL have that 10%, the remaining amount of 90%, the lion's share of the damage, will still be Physical, allowing Armor to still serve a purpose against her.
However, against Vayne, with all the things I listed above, that kind of logic doesn't work. Now you may say that what I say above only applies when using Conqueror, and that might be true. But Vayne doesn't need to take Conqueror. She already has true damage with her W. She's just fine with something like Press the Attack or some other keystone. But, both of the types of items/stats that you are supposed to build to counteract the things she brings to the table (Physical Damage and True Damage), she has something built into her kit that allows her to bypass them! That blasted Max HP% True Damage, that she is able to proc even faster with
.
THIS is why she is a problem.