Actually, riding horses is a great example, and you happened to pick a domain within which I dabble: People are not capable of riding horses today at the level of skill of a nobleman from Renaissance Europe. People at the forefront of the riding arts today read manuscripts from Guérinière, second-guessing at the meaning of every last syllable, because many of those sources describe things that are unintelligible and unfathomable today that seem to have been quite commonplace. And this is despite even the centuries of continuity of government funding for institutions that have been dedicated to trying to prevent precisely this. (Namely the Spanish Riding School of Vienna and similar institutions in Lisbon and Jerez, the Cadre Noir, etc.)

Also: Saying that "learn to code" has been reduced from a meme about a surefire ticket to economic security to the equivalent of glassblower, is not really refuting what, in broad strokes, the original point actually was; is it?

Similarly, I spent a few hours one day going down a rabbit hole of modern marble carvings, wondering if there were any hidden great masters of the art. I found that despite there being essentially limitless wealth and people compared to when the Pietà was made, there’s nobody making marble carvings like the masters did. Now there are some somewhat stylized marble carvings but in my opinion they pale in comparison to a masterwork marble statue. After all, why do that when you can just snap a photograph?