There's so much in this essay to unpack, it's all over the place -- more of an extended rant than any particularly cohesive argument. But one of the early points is "why is everything so gray instead of colorful?" Which is easy to answer -- when all your cars and buildings are super-colorful, they clash. They become garish and ugly and screaming for attention. Thank god we've moved to more neutral tones that actually…
Why are expensive "sports cars" almost always ugly (Bright yellow or neon green??).
One would think if you had that sort of money you would realize that a bright green car is tacky as F, but that is the point. To turn heads - this is why they bought the car in the first place.
Why are most cars not coloured like this - because it is ugly and most people don't drive a bright green "Honda civic" so people can look at them.
On the housing front almost every city has bylaws and restrictions on what you can and cant do. In the US you also have HOA's with even more restrictions.
As an example - I live in what was formerly a small village . In order to "preserve the heritage" of the area everything is architecturally controlled.
Developers always need to submit your plans for review, but this area is further restricted and has its own set of "rules" outlined in a 34 page document which is on top of the city guidelines.
So all the houses in this area look similar regardless of age by design. There are houses from the 1800's a few blocks away and my house which was built in 2000 fits in just fine from the exterior view. The interior is a different matter because it is not controlled and so it uses modern techniques like steel I-beams.