I'm still trying to figure out what a single cam does that a dual cam can't.
I can answer that. They can shoot heavy arrows (or any other arrow) more efficiently than a dual cam. As I am sure you know a solocam only loses about 1 fps for every 3 grains of arrow weight where a dual cam loses 1 fps for every 2 grains of arrow weight. In other words if you went from shooting a 350 gr. arrow to a 450 gr. arrow, you would loose 30-35 fps with a solocam and 40-50 with a dual cam.
Silent,
A bit to general for my tastes.......also every cam system has it's own efficiency levels regardless of single, dual, or hybrid and will react differently to varying arrow weights even within the same cam system.
For example.....you state that duals lose 40-50fps from a 350-450gr jump.
My 03' Patriot Dual Cam did not bear this out.
374gr= 318fps
474gr= 289fps
Net loss over 100gr jump in weight= 29fps. That's 1fps for every 2.9grs.
Food for thought.