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I'm not sure where people have gotten that idea. If anything a crank scrapper will make it less likely to have oil starvation because all lubricated parts are fed by the oil pump by way of the oil galleys. Oil that then comes out through the bearings and squirt holes just drops down as usual having done it's job lubricating and removing heat. Oil that would have been flung up by the crank say during sideways, acceleration or deceleration g-forces gets scrapped off and kept in the pan. That helps keep the pickup submerged under more adverse conditions and thereby keeps the engine from as easily starving of oil.
The only positive thing I can think of about having oil flung around by the crank is that more oil may find its way to the bottom of the pistons and have a cooling effect. Since oil is already getting there via squirt holes in the rods, I don't think that is such a big deal.
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