John Koller admits that PS Vita's message of "console-like games on portables" is essentially the same as PSP's, but argues that there was a significant problem with how developers approached that idea before.
"The issue that happened with PSP is we got overrun with ports," he explains. "It became very difficult for us to define what made PSP unique. The content development became a bit unstructured or decentralized, in that we got a lot of content that was on PlayStation 2 and got thrown over to the handheld."
That type of strategy died quickly and the Vita is just like the PSP as well as a PS4 useless accessory