Dialing in every morning?

Am I supposed to be dialing in every morning? Shouldn’t it be consistent throughout meaning grind settings all the same? I usually pull a shot in the morning just to taste. Grind size is always the same, puck prep is always the same, can someone explain to me the point of dialing in every morning when everything will be the same as yesterday? Am I missing something? We use an automatic espresso machine as well. What am I missing here?