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Peter's Principle in mmorpg development:
A dev can only do so much, until he/she hit a ceiling. In this case, the next senior/more experienced dev will take over. This goes on until the head dev is reached. When it is beyond the head dev's scope, well...
As they say "Employees tend to rise to their level of incompetence" so don't expect all devs are equal. Similar to your boss and your relationshop (if you have a boss, that is).
The possibility of the universe collapsing into a singularity is higher than the birth of a perfect MMORPG.