Friendlier UI, that's for sure. There are some initiatives trying to create a CMS-like experience over plain markdown files and git, but none compares to a proper content management system.

Static sites are kind of the ultimate caching system. Faster and has zero attacking surface. There is no zero-day for plain HTML. And some prefer managing content directly in files, like programmers that use vim instead IDEs. Kinda charming, if you ask me.

I wonder if a Drupal plugin could generate the whole site as static content. Especially good if it could publish the result on a separate, public, server. It would get the best of both worlds.