Re #4 - only thing I'd add to this is that the slightly greater string length from the saddle to the tailpiece, and the shallower break angle over the saddles, makes the strings feel a bit more 'compliant' compared with a regular one-piece bridge. Both these factors give the illusion of slightly less tension but in fact it's just down to the geometry and the strings moving ever so slightly more freely over the saddles. The string tension itself is exactly the same as if they were on any other bass of the same scale.