Because modern anarchism would call for the concentration of power to be disspated out of necessity via a well educated mass. Not every concentration of power constitutes as a "ruler".
The system would call for a directly representative democracy. One where the ruling class isn't only the minority bourgeoisie. But the majority prolatariat and the petty bourgeoisie. Our system is flawed in that the majority are ruled by a rich minority.
Once some general guidelines and rules for the soceity at large are drawn up BY the soceity at large. Modern Anarchism would be quite beneficial.
Do you really think we should be always ruled by a rich minority of people who don't have the majorities best interests at heart?