Here is some of the interview.
“I think we were late to offer the platform-level support, to make the online functionality work at that level,” said Yoshida in the latest issue of Edge. “We made the prior decision that you do not introduce the common centralized network names into every experience, so publishers made their own. That was fine at the start, but as more and more games have online functionality you need a unified approach.
So MS took that approach in the last generation and maybe thats where people see the difference when they compare Xbox live and PSN.