Northern Light
Superstar
That's the thing... architects and developers probably hire people with better taste on average than your median city hall planning functionary.
Now that one is tough too, LOL
I mean look at the median quality of what we've seen here over the last few years.......
I'm happy to (proverbially) throw both sides under the bus.
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There are ways to 'regulate' aesthetics, to a point, effectively. But aside from enabling legislation to do so; its not a small task to set it up, and any process will add a layer of approval (think of it as mandatory design review) which could easily add months to the typical approval.
It doesn't have to............
IF you look at Paris, France, it is very prescriptive in its designs in many areas. If you comply, the process isn't unduly onerous.....errr, for France.
But what makes it 'work' is a very clear description of roof-style, window-style, material, colour etc. etc.
You need something of a public consensus on what should be required........but you will, to some degree, stifle innovation. Whether you add cost or not is an interesting question, as a prescriptive system can result in more people making fewer designs of windows, doors etc. which can lead to more price competition, Its all very complex.