Using js to write a component framework is quite more heavyweight compared to using a browser supported system. In terms of weight, Polymer is less so because

Using js to write a component framework is quite more heavyweight compared to using a browser supported system. In terms of weight, Polymer is less so because it uses less js code (the most expensive bytes for all parties), has fewer dependencies, and doesn't try and render server side. As for ok'd versions: why is it impossible for a company or individual that needs it to maintain it themselves? Anyone using React or Angular also needs to do this. React seems, to me, to be too big to fail. And the existence of Redux should show: it is far from perfect.