Like anything it depends on your playing style. I own 2 basses with P style Pups (Cort Action 4 & Yamaha BB400 FL) and one with a MM humbucker (Washburn RB2500). The Washburn is the most versatile.
So no, I do not need a P bass (Especcially Fender) anymore then i need a Gibson EB-0 (ew) or...