I agree with virtually everything you've said, except for the part about limiting consumption. Limit consumption on certain channels (Facebook, Buzzfeed, etc.). Increase consumption on other channels (books, deeply analytical blogs, good magazines, and even fiction). And every so often, lose yourself on Wikipedia for a few hours. Jump down some hyperlinked rabbit holes there. Soak up random knowledge, purely for the sake of intellectual curiosity. Start on The Industrial Revolution and wind up, three or five clicks later, on the use of tunnel irrigation in ancient Mesopotamia.

The best way to become a better writer, a better thinker, or a more informed commenter, is to become a curious and habitual reader. Some of the best topical insights I've ever had have come from seeing analogs in wildly different domains. Some of the best writing techniques I've developed have come from reading wildly different writing styles. Almost none of this has been directed toward a specific outcome or contextual purpose. I read because I like to read. What I read may or may not prove useful later on. But it's almost always later on.