A engine have a powerband.
To optimize this powerbband and get all the power from the engine, you have to set the ignition everywhere on the powerband 100%
If you don't want a 100% engine, or you don't need a 100% engine, you don't need a timerboard.
If you only want to remove the heavy flywheel, you have enough of the HV-board and a sensor.
But with a complete CDI, you can get 10% or more power and rpm from the same engine you are using now.