Here is someone who "manages" what he does not understand. Do you want to be like him?
Do you truly wish to make network decisions in ignorance? You could harm more than your own systems. An improperly configured network is a network which may be open to attack, and could be used as a vector to launch attacks on
other networks. You may not care about your own systems. But you should be a responsible Internet citizen and not -- through willful ignorance -- cause problems for others.