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> A riser bar is not "effectively" lengthening anything, it is just raising the position of your hands up, vertically.
Pretend you swapped in a flat bar for the riser. To get the same hand position, you'd have to mount the stem higher on the steerer. But that's not enough. The steerer slopes toward you, so the stem would also have to be longer to compensate. Hence "lengthening the effective stem."
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