Champion Pick Rates

why are some champions sitting at 32% pick rates vayne, jinx, thresh, while others sit at 1% zilean, elise, galio, poppy, etc?

somewhere along the lines, players are choosing a handful certain champions frequently more often than most other champions.

is it because of lore? because of role position? utility? looks and aesthetics? or some combination.

from experience and looking at the overall list, you can see that "playmaking champions" or champions with the capacity to do something meaningful in some way and accomplish a task very well, are picked far more often than champions who have a limited use or "one trick pony"

galio can flash ult , aoe taunt once every 4 or 5 minutes. leona can aoe stun every 90seconds.

jinx can hit 5 targets with her Q for 20mana for full damage every auto attack. twitch gets "piercing" diminishing returns on his ultimate ability +300 range + 36damage. for 5 seconds. twitch can position himself better, but the tradeoff is sheer damage.

when you compare the bottom list champions to the top list champions you can see that the top have much more potential.

so whats the tradeoff? if a champion is highly picked for their utility, isn't that indication enough it should be looked at and heavily considered against the rest of the champions?