[{quoted}](name=Arcus Diabolus,realm=NA,application-id=3ErqAdtq,discussion-id=Uh62A8OE,comment-id=000b000000000000,timestamp=2017-05-28T02:40:46.591+0000)
Chill.
I'm completely chill my man.
The point is Riven does not actually outscale her.
Your point is wrong, Riven vastly outscales Illaoi my friend.
http://lolalytics.com/champion/Riven/
http://lolalytics.com/champion/Illaoi/
Go to win rate by game length. Riven's is 52.6% past forty minutes, Illaoi is rocking the hot 47.1%. Go to any other statistics site. The actual numbers may vary, but they will all support the point that Riven outscales Illaoi.
I could kill her early but not late. She was beaten by an item, not Riven.
It doesn't matter that you couldn't duel her late game. Illaoi is simply not as useful to her team as Riven is to hers late game, therefore Riven outscales Illaoi.
To use another example, you know how I mentioned Wukong? I'm not 100% positive, but I am very confident in the notion that Darius would dominate him 1v1 late game. But Wukong still vastly outscales Darius, because while Darius is a fat fuck who gets kited in team fights, Wukong can dictate the course of a team fight (and thus, the game) hugely late game, all by himself.
Also, what is your second point supposed to say? She was beaten by an item? Items are the things that primarily allow champions to scale. Riven happens to scale very well with the items you built due to her kit, and Illaoi's kit means she is cripplingly weak to certain purchases as the game goes on. Hence why she scales poorly. As other champions begin picking up more items her effectiveness wanes, whereas Riven's is still very good.
EDIT:
would be useful, but someone had to bring her down low enough to convince her to use the ult to begin with, so I tried
considering the health stacking she was doing. Next time I'll try Mortal Reminder, tho. Its worth a shot. (Now, I just need someone to pick Illaoi again...)
Riven as a champion does enough damage to hurt Illaoi with the right items.

If I wanted to duel Illaoi as Riven, this is probably the build I'd choose. You might still lose though, idk. I'm not sure if Riven can 1v1 Illaoi late game. Dodging the E might be mandatory, as might be kiting out her ultimate. I can't think of a better build for it than this however. But this is beside the point. Dueling strength is not how scaling is measured. Otherwise, most assassins would outscale almost every ADC but Vayne, and, well, they don't.