Really it was more of a shifting design trends thing. If you go back to the dawn of consumer TV in the late 40's both styles and some others we have not seen made since were played with, and both pretty much coexisted all along with the relative popularity varying all the time...It started becoming more of a monoculture in the 90's because most of the sets were Asian made, and cheap commodities by then...Once a product hits that point stylistic creativity/diversity tends to die.
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