https://astralcodexten.substack.com/p/highlights-from-the-comments-on-modern

Thanks to everyone who commented on Whither Tartaria (currently 1079 comments). Many of you really like modern architecture, and many others of you really hate it. I appreciate most of you being able to accept disagreement on that and move on to the bigger question of why there's so much more of it now.

The most interesting thing I got from the comments was Chaostician linking to Wikipedia's page on the Great Male Renunciation - men's fashion changing from ornate colorful clothing to dark suits. Wikipedia seems pretty convinced that this was because of egalitarianism norms:

The Great Male Renunciation is the historical phenomenon at the end of the 18th century in which Western men stopped using brilliant or refined forms in their dress, which were left to women's clothing. Coined by psychoanalyst John Flügel in 1930, it is considered a major turning point in the history of clothing in which the men relinquished their claim to adornment and beauty. The Great Renunciation encouraged the establishment of the suit's monopoly on male dress codes at the beginning of the 19th century.

The Great Male Renunciation began in the mid-18th century, inspired by the ideals of the The Enlightenment; clothing that signaled aristocratic status fell out of style in favor of functional, utilitarian garments. The newfound practicality of men's clothing also coincided with the articulation of the idea that men were rational and that women were frivolous and emotional.