I've recently removed pennants from frames in which the glass was pressed up against the pennant for 15 years or more. None have had any issues with sticking. But I don't blame anyone for being cautious and using the stitching method.
I just can't bring myself to have it done, and it's an expensive process as well. When you have only a few to frame, I'm sure it's worth it, but when you have a few dozen, it gets rather costly!
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