I'm sure that someone will correct me if I'm wrong here but...
GP shifting was created by racers. When they are leaned into left-hand corners, there is no room for their left foot to get under the shifter for the upshift driving out of the corner. If they could get their foot under there, it would either get torn to pieces, or would greatly decrease availible lean angle. Thus, if you reverse the shift pattern, their foot does all the up movements (down shifting) before the lean, allowing the foot to rest on top of the shift for the upcoming upshift out of the corner.
Plus, clutch-less up-shifts are just a tad bit quicker clicking down rather than up.
On the street, I don't really see that much need for it. I have one cloverleaf that is on my way to work, and everytime I get 3/4ths through it, I need to upshift, and I'm leaned over so far to the right it is awkward to get my foot under the lever. That is the only example I can think of.
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