It even clutters the layout with logic. Can one still call something like that semantic? I am a person who differs between <b> and <strong> and <em> and other tags which are often misused in semantic HTML and Angular.js agitates me.

In my opinion, Polymer.js is a lot more semantic (and generic). It would be very easy to use a Flux-like event-driven architecture (for ex. React.js) or something data-driven (like Backbone.js) with Polymer.js. Why do people still consider using Angular.js? When is it appropriate to use Angular.js? When is Angular.js the best / only option?