I'm curious as to what this change buys us. Why do these buttons have to be anchors and not spark-buttons? Also, I really like Polymer's declarative way of binding behavior to UI using `{{}}` in the HTML, as opposed to dynamically finding elements via querying by ID in the code, and this change reverts that. I guess even with anchors you could say `<a ... on-click="{{someMethod}}">`, since this code is within a Polymer element, so binding should work.