I'm glad to see someone advocating sensible retirement planning here. Though the post had a few good points about how to perceive wealth vs. money, I cringed at the notion that most stocks are "buy and pray" investments. Stocks have a better risk/return profile than just about any other asset class with a given 10+ year time window over the last century, assuming proper diversification. I should also point out that stocks, by definition, are ownership.
That being said, it is important to further diversify within a stock portfolio by having a good mix US, European, Emerging Market, small/mid/large cap, etc. As one nears retirement, risk can be reduced along with return by shifting into bonds. Again diversification is useful here. Have a good mix of both corporate and government, high quality, high yield, floating rate, inflation protected, etc.
Of course, developing a skill is a way to increase your wealth, as defined by the article, but diversified equity and fixed income holdings are a way to protect that wealth for a time when those skills are no longer relevant, whether it is by the slow erosion of time or a sudden unfortunate event.
I also found the article to be lacking. The overemphasis on "income-generating" assets does indeed reflect a misunderstanding of any sort of risk profile, as does the "buy and pray" moniker.
Income-generating assets do have a place in your portfolio, but certainly should not be the majority especially if you are so far away from retirement. As you mentioned, as one ages the allocation can be changed. Towards retirement and into it, income-generation should have a much bigger proportion as it better reflects one's needs.
That being said, it is important to further diversify within a stock portfolio by having a good mix US, European, Emerging Market, small/mid/large cap, etc. As one nears retirement, risk can be reduced along with return by shifting into bonds. Again diversification is useful here. Have a good mix of both corporate and government, high quality, high yield, floating rate, inflation protected, etc.
Of course, developing a skill is a way to increase your wealth, as defined by the article, but diversified equity and fixed income holdings are a way to protect that wealth for a time when those skills are no longer relevant, whether it is by the slow erosion of time or a sudden unfortunate event.