Why can't you sing oratorios with headphones?

It is a truth that you can't walk in a straight line with one eye closed and you can't turn off the light without a needle. Ears help the brain determine the pitch. Wearing headphones will hinder feedback. And the sound information of headphones interferes with our brains. When the brain reacts, we will hear another voice and sing along with it. It is said that you can't use two things at the same time. More adaptation should improve. People's feedback system will never rely on only one organ. The feeling of air flowing through the throat is another. You have no sense of belonging.