But the whole point is that by reducing the number of choices, that it becomes simpler to start. It's even in the docs:
Q: Why did you make this?
A: I wanted to see if it was feasible to use S3 as a CMS, and I like working on projects like this for fun.
So the author wasn't trying to create a static site CMS (there are LOTS of those already), but something different and maybe simpler.