Most people remove them but I adore them. I find them to be the most comfortable place to anchor my thumb. I don't like hovering and am uncomfortable anchoring on the jagged edges of the pickups. I also feel like plucking over the P Bass pickup to be too woofy. On J basses, plucking over the neck pickup is also too woofy and plucking over the bridge pickup is too thin sounding. The pickup covers allow me to pluck right in the sweet spot where the sound, tension, and spacing are just right.
