Polymer was incredibly even slower that React and even more overbuilt, and it had the added negative that it tried to enforce a visual style as well, which was

Polymer was incredibly even slower that React and even more overbuilt, and it had the added negative that it tried to enforce a visual style as well, which was too much for most people. Google couldn’t spend its way out of that hole. As for Web Component specs, we got v1 because of Apple and Mozilla: Google would happily have stayed with v0.