Since most boards have BMS bypassed, and only charging is used, for balance, could we use only active balancing, to keep pack equal? And, we could have the plug accessible, so that you plug in the balancer, as needed. This would eliminate the slight drain when asleep. Thus, you could have a balanced battery, no phantom power loss, and full discharge available.
The vesc disallows over discharge. The charger disallows overcharge, if relatively balanced.