I thought about it for a while... simply because I have a Series II equipped bass somewhere in the pipeline. It already had the Master Volume in addition to the Series I electronics, and I remember using it quite a bit. A selector switch isn't a necessity for me, as almost 100% of the time, I play with both pickups on, and mix them a little with the volume knobs. About the only time that switch gets used is at set break; I alway switch it to standby before unplugging... just a habit. I can see where absence of the switch might corrupt someone else's groove. I envy these guys that can make those lightning fast adjustments in the middle of songs without missing a note. I'm kinda' set-it-and-forget-it. If I know the next tune requires a little bit more presence, I might dial-in a little more bridge pickup or open the filters a bit before the intro.
That's a really pretty bass. The shop who ordered these builds had exquisite taste.