Why do coaches aren't allowed to talk mid-game?

I'm always wondering, Why do coaches aren't allowed to talk mid-game? and for what happened with T1 makes me even more wondering. can someone help me with this? thanks

Because its a 5v5, not a 6v6

if coach can talk, you just kinda need to build a team with as much firepower as you can since u dont need someone to call shots, igls will be pretty worthless and every game is braindead asf

ciro [#2]

Because its a 5v5, not a 6v6

i mean.. u only have 5 players to shoot and throw utils since those are the only ways to win

ikramspp [#4]

i mean.. u only have 5 players to shoot and throw utils since those are the only ways to win

coach can igl, so the 5 players can be godly mechanically but braindead snowflakes in reality and the coach can just orchestrate them and boost their morale.