How do they watch Yay last year and decide "yea lets sign him for a load of money and have him play anything BUT chamber"
Yay only looks tier 1 on chamber so you might as well use it
The thing is pro players clearly don't value chamber at the moment. It doesn't matter that he is good on Lotus if there are better picks and it seems that way based on recent tournament data. NA open Qualifiers he had at most a 15% pick rate and that was on bind. He only got played at champions by like 3 teams and half the games were on bind as well.
Maybe we will see him pick chamber up again on bind but for now pro players don't pick chamber on other maps.