I'm planning a post where I go deeper into the 3 main points based on the information found on the whitepaper.

The main objective of the project is to have websites on the chain to have less vulnerability to ddos attacks and the side chains are there to basically prevent too many websites from bloating the main chain, some sites will run on the main chain and some will run on side chains.

Centralization of the network won't be an issue since x-nodes allow every user to be their own "masternode" per se, I'll go deeper into the subject on the weekend probably.