That comment seems off-topic, but just to exemplify: In your example even as the interface for those products is unstable (UI that changes all the time, slight

That comment seems off-topic, but just to exemplify: In your example even as the interface for those products is unstable (UI that changes all the time, slightly broken API), those products are coded in a language like C++ or Java, which benefit from compiler error checking. The seams where it connects with other systems is where they're unstable. That's the point of this blog post.