Machlokes. Haga atzmicha – do you think those of us who are makpid on CY like to waste money for no reason? Yes, there’s room to be more meikil on cheese (and in the past, butter) than on milk. Yet, the majority of those makpid on milk also follow the sticter opinion on cheese.
Even many of those who were meikil on butter are no longer meikil, because they changed the way they produce butter.