Generally classical music has more dynamic range than popular music, some passages are barely audible, while others are explosively loud, so I think they are a

Generally classical music has more dynamic range than popular music, some passages are barely audible, while others are explosively loud, so I think they are a bad fit for noisy public places. Also many classical works wasn't composed as background music, but rather as music that itself is the centerpiece of a performance, and thus they do need more attention from the listener, rather than remaining in the background of things.