As I understand it, Phil also came to the conclusion that it was a bit much. I see this set up as essentially an on-board SF-2.
As for the audience, I strongly suspect that 98% of the audience hears no difference from one bass set-up to the next. It's like my theory on mistakes: For every ten mistakes I make, my band mates notice one. For every ten mistakes I make that my band mates notice, the audience notices one.
One of the things I LOVE about Alembic basses, (from the perspective of a guitar player and/or audience member) is that the tone is so clear and present that even non-musicians often notice the difference.
As for Jaco and Stanley, along with such notable Alembic players as Phil Lesh and John Entwistle, they all prove that 90% of one's tone is in the fingers. (Of course the late, great Yogi Berra would add that the other half is the bass and rig)
Bill, tgo