Differential looks like a small designer shop which does small UX-centric web apps. If they will be doing any serious server-side development in future they wil

Differential looks like a small designer shop which does small UX-centric web apps. If they will be doing any serious server-side development in future they will have to hire guys who know serious non-script languages. But for now Meteor looks like a good fit for their needs. And of course they want some cheap PR, so it's good to over-generalize to make Rails developers pissed (for no good reason).