Hi there.
All good questions.
The idea of this plygin was to be able to handle high traffic websites.
We used custom db table to store views, custom db queries (and extended WP queries) to speed up the requests.
PVC is grouping results for yearly, monthly, weekly and daily views.
It also supports object cashing like Memcached or Redis.
I’m not trying to convince you to use it – we already have users who switched to PVC because of the optimization and scalability reasons. I’m just curious how would that perform on your website.