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No filter is perfect, especially not a vacuum tube based notch filter. They were only working with what they had available at the time, so let's not bash the engineers for only doing what they could.
It's the thing with my Corvair, which has the factory turbo option. The only way they could figure out how to control ignition timing is to only have mechanical advance and a diaphragm operated boost retard (the opposite of vacuum advance) to avoid detonation. Does it seem like they could have gone about it a better way? Sure, but the lens of time and technology always does that. I would say put yourself in their shoes, they did pretty good if you ask me. I have fun digging into the history of these now extinct signals, and when you think back to the constraints they had to deal with it quickly becomes obvious that it's a wonder it works at all!
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Evolution...
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