I was taking about during, in case of string breakage. That is where you would, unless you have taken a back up bass, would be in a hurry.I wouldn't change strings before a gig (new strings sound like crap to me), so all of that doesn't apply in my case.
A bridge with open attachments for the strings is very useful if you want to avoid twisted strings though, or if you ever change between sets of used strings (I do, sometimes). Maybe it's a slight drawback if you are really in a hurry. I just don't see when that would happen.
I've never had an issue with a twisted string on traditional bridges apart from a Rotosound Trubass on an ABG once with through bridge stringing.
