You completely missed the point of this documentary if you thought it was about how “social media is bad.” The point here is to explain how the simple success-metric based algorithms to optimize toward goals like “engagement" create bubbles of confirmation bias and only expose us to the things the algorithm thinks will get a reaction from us (view, like, comment, share). Most of rhe people in the documentary (aside from Jaron Lanier) even go to pretty great lengths to expound on the VALUE social media offers.
Long story short, I view this as an important documentary so people can UNDERSTAND how social media, news feeds, and most other online experiences are optimized almost exclusively on business-based goals, and not the greater social good.