Yeah, there is some explanation revolving about the voltage to fire under compression vs the voltage to fire NOT under compression. It is a circuitous explanation, and I took it on faith.
One big plus about a Dyna Booster: if it dies, you can go back to a points-only ignition by swapping a couple of wires. BT,DT.
'73 R60/5 Toaster
Luddite. Not just a philosophy, a way of life...