Ask HN: Why isn't Google's Polymer framework more popular?

There is a lot of hype around React at the moment. It just seems like Google's Polymer framework is being completely ignored by the masses. I've tried many different frontend frameworks (including React, Angular, CanJS, Backbone and Knockout) but I personally like Polymer the best. Is there something fundamentally wrong with Polymer which makes it undeserving of any hype?