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Regional identity
You can blame this guy: Adolf Loos, at least in part.
Major influence behind Modernism. He was mainly reacting against Art Nouveau which he was a staunch critic of.
"The evolution of culture marches with the elimination of ornament from useful objects" is the core theme of his essay "Ornamentation and Crime" .
Basically,
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ornamentation causes buildings and useful objects to go out of style.
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Things that go out of style require materials and manpower to update.
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It is the moral imperative of the designer to make useful things, things that need to be redone are less useful and are wasteful.
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Therefore it is the moral imperative of the designer to remove all ornamentation from design.
He saw ornamentation as "degenerate" and equated ornamentlessnes with moral and intellectual development. He also made it a race thing. He used the example of people from Papua New Guinea having tattoos. Paraphrasing: "these primitive savages ornament themselves with tattoos, we enlightened europeans don't. We smart, they dumb. Therefore ornament = dumb bad, no ornament = good smart. See?"
He was a major inspiration behind the modernist movement. It helped that unadorned buildings are cheaper and easier to construct - especially with the advent of cheap glass and steel construction. So you end up with this sort of soulless architecture that gives no sense of time or place - that tells you nothing about its purpose or the people who built/use it.