Mostly on the load. If you have a high load there should be no need for the bypass no matter what. How ever you can also get bad quality lamps which the bypass helps smooth the dimming if you don't have a neutral for example.
I have the H2 LITE
and have a local wholesaler.
That's odd. In that range with or without the bypass it should be good. If you have a mix of old and new I wonder if they changed their dimming from trailing edge to leading edge . The dimmers do both but you can only have one type per line.