A perfect example is one we ran into over the weekend while working on this very blog. We're running a Ghost instance, which is respectably complex production-ready app. For a bunch of guys just looking to make some stupid blog widgets, it became obvious that reverse engineering the undocumented inner workings of an open source node app was a rabbit hole of complexity.
In our case, AWS is useful for enforcing separation of concerns. Instead of building new logic into a live app, we can build that logic elsewhere in a way that's reusable across multiple apps.
11.30 GEEK