Bob's Theory of Ignition "Design" - If problems arise from difficult to tune Tillotson knock-off carbs that the engine manufacturer INSISTS on using (DLE 20 as an example, maybe others), modify the advance curve in the processor so that the engine won't idle down faster than the carb can reduce the fuel.

Or, in other words, "Fix" bad carburetor and reed copy-choices by tweaking the ignition curve so the engine assembler doesn't go to a different ignition.

Just sayin'.....