We know from that one episode that certain officers had biases against being commanded by an android.Up until the Romulans joined in on the UFP side. Why Data didn't get a command of his own in war time, when they need every experienced officer they can get, and he already had time in a center seat, doesn't make sense. Don't get assigned to a hero ship. You'll never get away from it. Even if it is lost. They'll stick you in the same seat on the next letter of the alphabet.