☕ Let Me Tell You Why That's My Opinion On: www.polymer-project.org

Maybe I'm missing the purpose of polymer, but I suspect the issues the author mentions are a version 1.0 issue.

To me, polymer is to get people used to writing web-components, and polymer provides a nicer api than web-components. A bit of structure, easier to understand, etc. etc.

Things like tightly coupled javascript, css, and html is kinda the point of a web-component.