Nothing against product analytics, but my conception of product analytics is that it's mostly data around active users; that's different from GA. The problem I have with "articles" like this is they usually seem to have implemented either only basic Google Analytics or did Tag Manager badly.

Sure, organic clicks aren't always that helpful. But downloads, source for downloads, purchases, conversion funnel analysis etc. aren't vanity metrics and all are available with free google analytics; you just need to know how to set it up.