The consequence is, if you use a proper CAD (which has to have good, quick to use drawing tools), finding, downloading, double checking and often modifying the existing footprint tends to take more time than drawing it from scratch (and then you get the layers as you want them). And, based on what I see on the forums and like, I'd guestimate that a wrong footprint is #1 reason for respin for hobbyists. I have had to rework boards because I thought that I could safely use the 1210 capacitor footprint that comes with Altium. The risk is, in my experience, tens of percents, if not more, per footprint. Having an incorrectly made footprint in a poorly maintained library is super common. A word of warning: if you use footprints made by others, including the libraries that came with your CAD, double check very carefully against the datasheet.
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