Riot admitted to it everybody
They really do balance around flashy LCS plays.
"Another thing we generally try to avoid are extremely low-lethality metas for Worlds. A recent example of this is Tahm Kench—we expected him to have a very high pick rate and somewhat low ban rate. We think that at such a high presence, he degrades the quality of the play and viewer experience. As such, we reduced his early safety in patch 9.19."
As can be found on the new ask Riot https://nexus.leagueoflegends.com/en-us/2019/10/ask-riot-worlds-tokens-meta/