The ship takes care of almost everything. It will tell you if there's a condition that needs your attention.
We're still in a high traffic area. If traffic control calls, the ship will need your approval to change course. It affects where our drive plume goes and we don't want to spray anyone.
So, basically, keeping humans in the loop.
An annoying policy. If we could get humans out of the loop, it would remove our greatest point of failure.