If you have a website that is making you money (saas service, blog with ads, etc), these two basic metrics mean very little. Segmentation, conversion funnels, device/os info, etc are necessities.
Basic web server log analysis stopped being mainstream in the early 2000s, and I see no reason to bring it back.
I can think of some reasons from the top of my head:
* It works even if the user is using a blocker;
* You don't have to add a script that's constantly making AJAX calls, so you site should load and run faster;
15 or 30 seconds per day, instead of several minutes + twenty clicks in a row on UI elements (too annoying for me).
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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.
I still use it, and I find many discrepancies between the server logs and what appears in Google Analytics.
And having the raw NCSA logs allows me to run specialized queries on the data.