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Only reason I can think of to ride "classic" drop bars is to get the levers lower and to get further forward when seated into the drops, which kinda makes sense as it looks like most pro riders are riding a size or two too small.

In the curves, when putting the hammer down, you have better access to the gears.

The flat part of the drop is also flatter, so is better for a fast low cruising position.

The reason us mortals love our compact bars is the short reach, and short drop demand less flexibility.