From a manufacturing standpoint... plastics are cheap and easy to reproduce. Plus the cost of retooling to update your interior or exterior designs is generally cheaper than that of metal or other materials.
As far as looks are concerned, I think desingers are always wanting to do something that hasn't been done before. I know I hate being accused of simply recreating someone else's work. With so many designs from the past, its hard to keep ahead of everyone else without trying to make attempts at getting far ahead of your competition.
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