Not necessarily. It's just funny that they're bragging about choosing these particular technologies when they've all fallen out of favor in the last year and a half or so. Odd to see in a tech demo writeup like this.

My point (downvotes aside) is that Polymer (or any UI library -- react, angular, whatever) is overkill for this type of application. Without digging too deep into their source, it seems like it could've been done easier and cleaner in vanilla JS and ThreeJS.