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".

It is quite obvious you do not understand and you are bullshitting your FUD.

Hey I don't give a fuck if you don't believe me. It is your loss, not mine. You are the one who should being doing some research so you aren't so ignorant.