Because you can not see champion statistics nor ability details until you are in the game, and have that level of ability. There are no tables which say, here is your attack range. There is nothing that says, here are Yorick's hps per level. There is nothing that tells you how much damage your abilities will do, whether they scale with AD or AP, at what percentage, the UI basically gives you no information. In order to get this information, you have to look at websites like MOBAfire or whatever your poison of choice is. So why would they call these relatively minor in-game changes "Clarity" when there's a gigantic mammoth in the room of not being able to log into League of Legends and stratagize over your statistics and abilities before a game? It makes somewhere right around zero sense.