As analytics in general is pretty complex, it's hard to compete in terms of features with Google Analytics and systems like Piwik. I personally never used the site statistics in 5.6 as it didn't have enough stuff to get insights from.

So it might be cool to see a really slick Piwik (http://piwik.org/) add-on for 5.7, one that integrates seamlessly with the Dashboard, maybe integrates more deeply to capture site searches. Piwik's API could potentially be used to create quite a rich experience within the dashboard (and saving a huge amount of development).

Yes it would be easier to just install a package to add analytics, but my concern would be the experience wouldn't be 'rich' enough, or at least rich enough compared to exiting expectations.

It's not easy to build up a tool like GA. Therefore, it's better to use Google Analytic instead of building up a new tool.

To be more specific, I am looking for something similar to this 5.6 addon:
https://www.concrete5.org/marketplace/addons/stats/...

Also, what about integrating something like this:
http://www.openwebanalytics.com/...