No offense taken. You basically nailed it. I was used to playing the same Jazz bass since 1976. It never failed me, except in the old days when I did a "slide bass" solo with a beer bottle and a drumstick. Beat the heck out of it and occasionally lost a string.
The broken D string didn't impact me too much, The band just wondered why I was less talkitive than normal. There were a couple bass players in the audience that noticed and were pretty impressed with my ability to play around it, and again, the rest of the band didn't even notice an increase of clams, (there weren't any).
I can play around broke strings, but if anything, I began to wonder what happens in the event of a preamp fail in an active bass. Or something more catastrophic like me tripping on stage and trashing a neck. Could happen, and it's not to tough to have a bass backstage and have a stage hand grab it for me. (I'm not a fan of multiple basses on stage if I can avoid it).
I was always a one bass guy... actually only owned one bass, till one of my more recent bands started bugging me about not having a backup. So I bought a bass he hated and used it on stage (Guitarists seem to really hate Peaveys apparently) Since then I've been bit by the bug and in the case of this broken string, it was a bass I'd only played a couple weeks.
Now, not only do I have backup basses, I've got an optional in ears system, wedges that can easily handle the bass, and just for fun I've got an elf tucked away.