This is the reason, at least for me: https://news.ycombinator.com/item?id=13674984

15 or 30 seconds per day, instead of several minutes + twenty clicks in a row on UI elements (too annoying for me).

--

Yes, as I mentioned on README.md, it's cool for small or middle-sized websites, but not for more advanced use cases.

But then, if you use OWA or Piwik, be prepared with bugs, slow UI with the default settings (I tried several times, with different servers), etc.