Sure, but this is a bit like asking “Why do people have 25-inch monitors? Couldn’t you be productive with just a 15-inch one?” You don’t *need* the extra space, but it is useful to be able to see and manipulate more information in a given amount of time than you’d be able to on a smaller screen — or on just one screen.
With traders, for whom time is of the essence, any advantage they can gain in terms of the speed of their decision-making is (in theory) going to help them make more money.
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