Harmful to whom?

To a far greater portion of human society than those it was perhaps useful for, if anyone.

Yet, it was the horrible, horrible Europe that Moldbug mythologizes and romanticizes that made virtually all advances in science and technology until a few decades ago.

Ancient Greece produced mechanical computers. Only recently did the great civilizations of China and India overcome Hellenic science & technology. Having Mandarins cataloging the Emperor's property is not a great use of human capital.

What? Non-sequitur much?

While the so-called European Miracle of the past 500 years is a fascinating and complex area of research that will undoubtedly be studied for generations and centuries to come, I wasn't aware that anyone considers modern (18th c. and beyond) romanticist ideology to be the major driving force of science and technology.

"Romanticist ideology" is a remarkably vague term, but I think one could make a case that something like it ended up being very much a factor. Of course, the reverse is also true; in the absence of 18th- and 19th-century science (including advancements in the social sciences, mostly coming from the "humanist" side as Carlyle knew quite well!) no "romanticist" ideology would even exist.

That’s a... debatable assertion about the history of science in those places.