If you understand the math models involved, you would understand that he is using "difficult" as a nice way of avoiding saying "centralized is the only way, but we are praying our understanding is incorrrect and we can find a miracle in the mean-time".
Are you referring to the the shortest path algorithms? I wouldn't even consider those complex. I have one implemented in Java, it isn't certainly something special nor hard to understand. Besides, this is what you think that he 'meant' by that. How about you ask him to clarify, rather than make assumptions?
Hey I don't give a fuck if you don't believe me. It is your loss, not mine.
Useless thread is going to stay useless, nice to know.