So, first off, is there a discord channel that you frequent that one can have a bit of a back-and-forth dialogue with you? The data sites I frequent seem to be immune to pulling data from into an R instance, and I'd love to work with even a fraction of the data you guys at Riot work with that you use to justify your decisions.
As for addressing Yasuo: again, I submit that there's a lot of popularity factor going into his playrate. That is, if he looked like a pile of goo, and wasn't voiced by one of the most talented voice actors in the world (Liam O'Brien is awesome), and just "felt awesome" to play, I think his playrate would be much lower.
For instance, if Yasuo had Shaco's absolutely unreal statistics, I'm sure he'd get absolutely hammered.
Regarding mastery curves: finally, I've succeeded in making myself clear (I'm probably not too good at that :( ). My frustration, I suppose, is that there are champions in this game, that are most likely strictly better than other champions, across all points on the mastery curve. That is, a Shaco (going to use him as my whipping boy right now because his winrate is just unreal, and he's also aesthetically hideous. He's a freaking clown, for god's sake) just seems to win a higher proportion of his games than an Irelia or Yasuo the average winrate, and also at a "main" winrate, according to LoLalytics. Ergo, I would not be surprised if he had a higher winrate for any number of games compared to Irelia, Yasuo, or Akali. While I am fully on board with the idea that a hard to master champion might not crest into a positive winrate for a higher proportion of games--after all, that's what makes them more difficult), my concern is that they're not better on winrate statistics than an easier-to-play champ at any point on the mastery curve.
That is, consider this little mockup image of hypothetical mastery curves. My frustration is that for the pain one goes through (all the 1/10/3 games one might have early on trying to learn, say, Yasuo or Akali), that once you get to the tail end of the curve, you just have some person spamming the crap out of Shaco having the time of his life on Summoner's Rift, for less effort across the board.
I understand that champs like Yasuo or Akali may be popular, because a fantastic amount of work went into their visual, skin, and audio appeal (Yasuo is a badass samurai and delivers on the fantasy of playing a wind samurai, Akali's a punk ninja, and seems to deliver on that fantasy of playing a punk ninja), but as far as actual wins and losses go, I'm not sure that if we set the aesthetics aside, that these champions deliver on the raw effort/reward compared to some others.
Am I being clear here, or am I missing something?