COPs in combination with a crank trigger also enable a higher RPM limit. The crank trigger is not a replacement for COP, but having it ensures timing accuracy is the best it can be with any ignition system, COP or distributor. Just like COP, the OEMs use crank triggers to give the ECU better control over the ignition system. In the case of Pro-M EFI, the crank trigger kit also eliminates the need for a production quality hall sensor in the distributor and eliminates the need for a production quality shutter wheel in the distributor. Just like the way Pro-M EFI eliminated the TFI module as a failure point, the crank trigger takes the distributor out of the equation in regards to a common failure point. Anything we can do to improve ignition accuracy is huge win with the fox mustang. Don't get me wrong, I'm sure you could do without it but any daily driven car become more reliable using the crank trigger ignition. Here's a good explanation: Any ignition coil will have an optimum charge and discharge time. This is the time required to throw the hottest spark the coil is capable of. But with a single coil, this becomes a problem. As engine RPMs increase, there is less time between cylinder events, and therefor, less time to achieve optimum charge and discharge. At some point (typically around 3500 RPM), there is simply not enough time anymore, and the spark power begins to diminish. As the RPM's increase, there is less and less time, and eventually, the coil will not have enough power to jump the spark plug gap. This is not typically a problem with naturally aspirated engines, but if you are running relatively high levels of boost, you can experience “Spark Blow Out”. There are three ways to fix this. First, you can decrease the plug gap, but this will only get you so far. The second way is to add a CD box, which puts more current to the primary side of the coil, increasing the output of the coil. While this increases the output, it also shortens the duration of the discharge. It works, but it's not a great method, and these CD boxes are unreliable at best. That's why you will usually see a spare one in the trunk! The third, and by far the best way, is to increase the charge and discharge time. This is done by using multiple coils. A single coil will have to charge and discharge 4 times per engine revolution. Each coil in a Coil Pack system will only have to charge and discharge one time per engine revolution, and each coil in a Coil-On-Plug system will only have to charge and discharge one time for every two engine revolutions! Problem solved!
As far as the crank trigger is concerned check out this article:
https://www.motor.com/magazine-summary/performance-perspectives-april2015/ .