"Unpopularity of monsters"
So we aren't going to talk about Kha'Zix, Fizz, and Maokai being a monster?
Not to say your Data is skewed, but a lot of the "unpopular" Champions also haven't been perceived as strong in the last two seasons... However champions like lee sin have been considered strong Since S2 after release, same with yasuo and his release. So isn't this sort of self serving data? You tend to keep popular champs popular by allowing them to have a larger power budget for no reason (because mobility isn't considered a large factor in power budget). As another example look at damage with yasuo/lee sin and mobility. They do as much damage as anyone else and have super high mobility... Meanwhile you have other champs like Skarner that have been seen as trash since (shortly after) his juggernaut update, and have both lower mobility/sticking power, and damage than either yasuo or lee sin.
Could we also get some data on winrate vs popularity over time? I know you have the data. Just look at Maoki's playrate in recent patches... I'm pretty sure thats because of perceived power (aka winrate) relating to popularity, not because hes actually any more exciting to play. Another big example of this is possibly Kassadin, until recently he hasn't started to see an increase in popularity because of perceived power. I'm pretty sure he hasn't seen any buffs since 5.24 and yet he is increasing in popularity for no real reason. I'm pretty sure its because champions that suppressed him got nerfed... You could give skarner a buff that would put him at 55% win rate and tomorrow he would be one of the most popular champions.
(lel)

