He deliberately took a neutral stance (see first paragraph) on whether or not Yasuo was underpowered. He simply wanted to discuss your points and how he thinks that your reasoning is off in spite of your conclusions (strong or otherwise):
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You compared Yasuo primarily to 2 assassins multiple times. Since you didn't specify otherwise, it was safe to assume you thought he was an assassin given the comparisons. We all agree now that he is in fact not an assassin.
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I agree with the arguments he presented: To clarify, I believe Yasuo is VERY underpowered and over hyped, but your reasons are off for the most part.
So why is Yasuo weak? Well, in my opinion, even last season, Yasuo was not a strong champion. Unless you were a Yasuo one trick who was god like with his mechanics, you were lucky to hold around a 50% win rate. 50% is about where he was last season. Overall, seemed balanced. But this pre-season has really hurt him with its changes:
1- Fervor of Battle- feel like this is a dead horse being beaten again... but this keystone is what allowed Yasuo to have any kind of fighting power early while still being able to take full attack speed runes in Quints and Marks. Which is point number 2.
2- 29% attack speed in runes, 4% in masteries- 33% AS level 1. Yasuo gets with the preseason a whopping 22%(?) I think now? If he goes precision (RIOT gave him a 4% attack speed increase at level 1). That is a significant level 1 drop. In combination with the loss of Fervor ad bonus and the ever so slightly increased cooldown on his Q (scales with attack speed right?) Yasuo lost a TON of his early game power.
Now, some might say, thats not so bad right? I mean, Yasuo is a late game hyper carry right? I agree, except for the fact that:
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Games are snowballing very quickly right now. Last I checked, average game time is around 30 min. Maybe a few seconds less? Not sure.
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Tanks, who would normally be a good matchup for Yasuo, do TONS of damage right now. A lot of this has to do with the loss of flat MR people usually had on them. Most tanks deal primarily magic damage.
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There is not a great Keystone for Yasuo as of yet. Press the attack is no replacement for Fervor of Battle.
I could expound more, but I have to go for now. XD