No, but it does mean that as time progresses, chances of a detrimental mutation remaining goes to 0, while the chance of a beneficial mutation remaining goes to 1.
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Is that the benefit for lactase persistance? The extra calories seem pretty potent.
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I mean, in the sense that water flowing downhill has a "goal", sure, and in the same sense that if the direction the land slopes suddenly changes then the river's course and its eventual "goal" change just as suddenly
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Like, the reason getting old sucks and "diseases of aging" (including the steadily increasing risk of getting cancer in general as you age) is that there's no selection pressure against it If you live long enough to pop out kids that's good enough
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It's not ENTIRELY true, to the extent that having grandparents around helps the grandchildren survive, but yeah.
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