I've found the smartest people I know tend to embrace the ethos of this piece almost instinctively. As for those who have to be spoon-fed these strategies? Well, in short: they're not as smart.
Some of these skills are not mastered for multiple reasons: emotional ones like fear and apprehension or lack of familiarity with cultural differences, expectations, etc...
Smart people still have limits.
I for one used to be quite awkward, but had awesome friends that pointed out what (not) to do. Am I less smart for not having figured that out on my own? Perhaps, but I don't think it's relevant how skills are obtained.