Several bass players I know are confused by more than one pickup. They don't know what the 2 knobs do on a P bass or what the 3 J bass knobs do. But they know how to play the music so they're actively gigging.
Even if you explain that the 5 knobs on an active bass are volume, blend, bass, mid, treble, they don't have the tech understanding to know what those terms mean or how to apply them.
I do have the knowledge and yet I prefer fewer knobs. Go figure. Except on my fretless where the sweepable mid is really useful.