Lots of things are intuitively obvious -- but when articulated clearly, it is possible to understand them more precisely. That ay you can use the knowledge in a rigorous way, not just an intuitive way.
Maybe so, but this article doesn't even give us enough info to enable anyone to be rigorous. The takeaway was to "make your icons detailed enough, but not too detailed". Whether it's obvious or not, what is actionable about that advice?
Like I said, maybe a few more realistic and/or real-world examples would have made the actionable takeaway clear. As it is, it's just another blog post stating the obvious -- IMO.
