Your statement about self-sufficiency is universally correct, but does not make sense in the context in its current form, because noone is 100% self-sufficient, but everyone is self-sufficient to a degree. The statement you actually meant (assuming you had thought settled), which is: "it is always better to be a little more self-sufficient" is definitely technically incorrect or at least extremely dubious.

Also, irrespective of any assumption I might had (or not) about the author from a long post, you go much further assuming you know I had one, and that you know it from my single small comment half of which is original author's quotes.