My first bass was a PBass, and I hated it, a good friend of mine and fellow bassist played a Jazz Bass, and he was better than me (still is) and I wanted to play like Martin, he had two pickups and everything!!!! then I saw some guy playing a fretless, and I needed a fretless, then five strings, then six strings, and the next 20 years were spent looking for some kind of magic tone. A few years back I was thumbing through a 50 years of Fender book, and stopped dead on a large photo of a 63' PBass in oly whitr with a tort guard... then I just realised the tone I was looking for was in a case under the bed this whole time...
Jamerson, Babbit, Rainey, Felder, pino palladino....
I now have two P's in my stable, a fretless with flats, and a fretted with rounds...
Now don't get me wrong I'm not hatin' on other bass' or players, The players I mentioned above have rock solid foundations, yet are hardly Quarter and Eighth note Root and fifth bangers (though there is a time and a place for that). Also there are many notable players that venture out of the Pzone, and still hold it down (not every six string player is a fret board wanker, Bob Babbit, Chuck Rainey, Welton Felder, and Pino Palladino are all known to play non fender, non PBass, Bass' also).
I often reach for a Jazz, or a six string to get the job done when It needs something extra. but there is something special about that big split coil in the middle of an alder body that, a neck single coil with palm muting, or a humbuckler with the tone rolled off, just can't capture. now if I could get a six string fretless PBass with flats... then I could get that tone of my dreams.... with all the notes that I need on top.