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My uneducated guess is money.
Manufacturers likely have factories (either theirs or a contracted company's) where they can mass produce the power bricks for a low cost. Upgrading to a USB power supply doesn't offer significant benefits compared to the power brick of similar wattage, and the up-front cost of setting up a new supplier is financially unjustified. The old technology works just as well, so why change?
High power USB is still a relatively new technology. I'm sure it will proliferate, but the consumer market has a fuckton of inertia.