To Those Asking for Yi Buffs
Yi has actually been getting some indirect buffs lately and he's also receiving some in the future. Let's take a look.
1. The new jungle. His EXP and gold per second has gone up quite a bit since the full clear now gives more of it overall and because Machete got buffed. He also gets to gank much more in between camps since the spawn rate of the camps doesn't encourage perma clearing that much anymore, since you will have some time where you've just cleared everything on the map and where you will have to wait for camps to respawn.
2. Guinsoo's got 25% attack speed FOR FREE, the item didn't even get an increase in it's gold cost for that. Yes, the bug exists, but once that is fixed I think that the item will be absolutely amazing on him. In fact, I'm already finding success with it right now even though the bug exists, which just shows you how good of an item it is on Yi now.
3. BotRK also got a buff, in this case it's not as extreme as Guinsoo's though. But since it is an item that Yi actually picked up even before it got buffed it means much more for him. The extra on-hit also gets amplified by the fact that Guinsoo's and Double Strike will proc it very often.
4. Fervor gets buffed next patch. I'm sure that his horrible win rate at the beginning of the preseason was mostly due to the fact that it was changed from on-hit to AD which hurt Yi A LOT, more than I expected. Now that the stacks will last longer and now that you'll only have to stack it up 8 instead of 10 times and also considering the fact that all the other things I listed happened, I think his win rate will actually rise.
Lastly, just take a look at this http://champion.gg/champion/MasterYi.
The win rate for Master Yi just got updated on champion.gg today and as you can see, it is currently rising. If it keeps doing that I'm sure he will be fine again in patch 6.24 and that his winrate will sit at 49-50% again, and I'm pretty sure that will happen once the Guinsoo's fix and Fervor buff come through.
If he will still be sitting at 48% or lower at patch 6.24, then, and only then, I think Yi himself deserves a buff. With all the indirect stuff happening to him buffing him now would just risk that he would be over the top with a win rate of over 50%. And as fellow Yi mains, let me ask you this: What would you rather have, a Yi that you can play without restrictions that is only a little below average or actually balanced or a Yi that will have a higher pick and ban priority? I'd glady choose the first of the two.
