The cannon pinion is the central piece that the hands attach to, so yes it's pretty vital to the watch's operation. I can't say I've ever heard of a manufacturing fault in that area, but as you rightly say, anything that's manufactured can have faults no matter how rare. Without additional information on the defect it's kind of hard to say whether QC should've picked it up, but even if it was possible to pick up the defect, QC itself always has an error rate.
I'm not defending anything here as I know it's an absolute PIA when you're on the receiving end of faults, but unfortunately nothing is ever 100% all of the time. I think you have just been unlucky.
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