Based on my shakey recollection of the laws of physics, I think this is how it goes...
String tension is an inevitable issue with short scales, particularly with a B string. But sound is also determined by the degree to which vibration can escape from the string into the body, neck, etc, causing less to be delivered to the pickup. Since a shorter string has to vibrate slower, the tendency to lose volume and distort more easily. So the construction of the bass can improve on this pretty significantly by ensuring the greatest rigidity. I don't have any experience with other short scale 5ers (and I'm a 4 banger, myself), but I can recall that Alembic 32" 5 strings sounded great. I believe that was because of their very high rigidity. Players sometimes didn't like the feel of the B string (too loose), but generally agreed it didn't lack tone as much as it sounded distinctively "short scale", like the other strings on a 32".