Even then it was only ever a 2 year timed exclusive. The main series has never appeared on a handheld and the spinoff that did appear on 3DS actually released the same year that the PS3 got its improved version of Samurai Warriors 3.
And the second spinoff that released on 3DS the year after? :P
Regardless, it's not a "Playstation exclusive since forever" which is what I was responding to.