If you have a nonbalancing BMS, then with the unmatched cells in the pack, it will reach an unusable state at some point (sooner the less matched the cells are and the harder the pack is used), because some cells will be nearly empty while others will be already full, preventing further charge of the non-full cells, and without a balancing function there's no way to correct this (other than opening up the pack and manually doing it in some fashion).Is there any benefit in replacing the UUP BMS with one that will balance and provide some form of remote monitoring?
Remote monitoring can be useful in any pack that can't be trusted (which is most packs from most manufacturers and most sellers). Lets you see what's actually happening in there at any moment in time, during charge, on a ride, etc.
If the app that lets you see what's going on is any good (I doubt any are) it will also let you log data from the pack, set alarms to notify you of and shutdown conditions for various problems, etc.