My BMS (REC Active BMS) has a 2 amp active balancer, and I will usually be charging and discharging at low C, so I'm not too concerned about keeping them balanced.
The other point to make here is if you are using Canbus connected equipment like a Victron Multiplus as the charge source that 2A active balancer is actually a lot more powerful then it seems.
This is because as you start to get close to your desired peak cell voltage the BMS will tell the charger to ramp down on its amperage output to 2A per cell - 8A total.
The BMS will then actively divert up to 2A from the highest cell to the lowest cell; so the lowest cell is getting 4A now and the top cell close to 0A. This cycle repeats as the cells converge on the charge set point.