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by lukegb 3790 days ago
From what I remember, Polymer before 1.0 had some severe performance issues on browsers that didn't have native Web Components support, because it shipped with a polyfill that tried to emulate the shadow DOM properly.

I suspect (but have no evidence) that this caused lots of people to dismiss it because of that, and they might not have taken another look at it since 1.0 released.