have you ever see JKS talks crap during a lan game?
if they replace stewie with JKS, that will be 4 quiet people + Twistzz who rarely talks when he is kind of lost.
imo, liquid needs some people to step up/ voice out when they are choking because they always choke, that is what stewie always do.
if you realised, NAF,Elige and Twistzz always shine throughout the game but they are just quiet when the team is choking and Stewie is usually the one to end their 'choke streak'.
when they are 12-3 down against Astralis, Stewie get a 4K with USP in second half pistol round.
when they choked really hard against astralis on Vertigo (ECS season 8), stewie opens up A-site with an awp.
when Liquid choke against EG on inferno (Katowice 2020), liquid shut down EG at banana and win them the map
there are some others example but imo although stewie plays like a bot sometime but he is an important piece for liquid