A 3x crank wheel does not have the resolution to control individual coils. Look at the 5.7 which is a 4x. You don't get individual control until you hit 24x. Thats 6 times the resolution. Yeah you could say that each 3x signal will be good for one cylinder each rev but you only have that one pulse then the timing would have to be figured with rpm in mind through a timing formula. With more resolution you are getting those extra pulses in between to help trigger timing events without a complex calculation that would take more time to calculate than the event window is long.
Thats my take on it anyway
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