Fender bass bridges are near the end of the body and I remember talking about topic this years ago with another bass builder and tapping an unloaded Fender type body where the bridge is usually placed, it sounded 'lighter/hollow' as opposed to tapping the body more or less where the precision pickup would go, where it sounded quite different, more 'solid'. So possibly a Gibson guitar or (Les Paul type) bass has the bridge in the best 'area' of body wood while Fender type bridge placements dont take advantage of the best area to mount a bridge.......maybe leading to the idea of the high mass bridge to help overcome this.