Well said z987k. Well put, indeed.
I have a friend in the recording industry that uses ANR headsets sometimes while he's working alone in the studio trying to autotune some hack with industry money behind her trying to turn out the latest smoking hot, no talent, future coke addicted teenie bopper and he actually does suffer from hearing damage from years of being in bands. His ear doc (has tubes in his ears too) told him that using the ANR headset while working will actually prolong his hearing instead of trying to use the studio speakers when mixing.