I just don't buy all of this stuff about training, and need of advisors.  
I understand that training and education that one receives are very important.  However, any intelligent human being ought to be aware of her/his limitations and ought to seek to overcome them.  Being informed is one thing that intelligent human beings ought to do.  Bishops choose to keep their perspectives limited; it does not occur by happenstance.
I also understand that bishops are very busy.  So are most of us.  Yet, many of us choose to be informed about the issues about which we must make decisions.  That bishops choose to remain uninformed is sad.  Unfortunately, I don't find it surprising.  I think that it is in their self-perceived interest to remain in the bubbles which they inhabit.  That way, they can continue to pretend that they are acting appropriately, when they are not.