Treble can be rolled off hard (also flats, using flesh of fingers, etc) to get under it (first track in this thread),
or treble can be maxed (rounds, pick, etc) to get over it (Green Day),
but in the middle is a "belch":
-it's deeper and lasts longer than the J bass (bridge) "burp"
-it's more open-mouthed than the Ric (bridge) or Stingray (both more closed-mouthed, like a burp or belch heard through the nose),
-in a pickup even farther forward, like single coil P, it becomes a grunt, again more closed-mouthed.
I'm not saying it's "one trick"; I'm saying I think this belch is characteristic, and the way it's dealt with creates variety.