artists may find two samples equally important, at that time, music theory can help them. falling back to some rules and pre-concieved data help them choose something meaningful. an artist won't be persuaded by some rules, that's why it's called an artist. second guessing is part of being a human, it tells they care about product. many artist who follow their creativity fall from the world because nobody liked it. who will tell them, if it was really good or bad, music theory can help.