A blog post is fairly simple static content. My browser is an app that does fine at displaying it. By making the page an app that dynamically updates upon server changes, you actually substantially damaged my experience, as I was interrupted in the middle of reading the page.
I'm not opposed to apps which dynamically update data in real time from the server, when that's appropriate. A static blog post does not appear to be such a case.
The irony here is that this was on an article titled "Why Meteor will kill Ruby on Rails", an overstated claim describing how a framework build around updates from the ground up is so much stronger than one based on delivering static content. The actual behavior of the page seemed to speak more loudly than the content.
It's difficult to implement the same functionality with Rails, where the default is to be down while deploying.