So this is something that I have really pressed the firmware team on and the response I have received is that it is a hardware limitation. Our engineers chose to go with a MOSFET solution rather than a TRIAC solution even though the MOSFET was more expensive. They did this so that the dimmer would be compatible with both dumb switches and aux switches. Also so that the entire device could meet FCC requirements and not just the RF module.
Having said that, there are varying bulbs that may perform better with the device than others. So your experience may be different from other users.