I dunno... for what a rick costs, the discomfort of playing one, the amazing various tones made famous by Chris Squire, Geddy Lee, Fred Turner, Paul McCartney all different, all with stock pickups..... it kind of makes you wonder why you'd buy a rick if you didn't adore the sounds you could get from it.
I don't love the pickups either, mind you, but they can be made to do most of what most folks need really well. It will never be a precision or a jazz or a stingray or a spector, but it'll get get close enough for general use and has all of the rick tones as well.
Definitely, imho, I'd not touch the pickups (other than height, wiring etc) and focus on outboard gear to get the tone you want instead.
Bonus is you can then work on tones from that same outboard gear sound with every bass you play, although they all will offer different versions.