Many "progressive" social science types are committed to the belief that it's possible to "fix" inequality of outcome. Pinker's rejection of "blank slatism" threatens that belief. That's a big reason he's disliked.
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But that's irrelevant, since: a) Even if blank slatism is *true* & there was equality of opportunity, equality of outcome would not be guaranteed - chaos theory shows that even unmeasurably small differences in intial conditions would result in divergence.
Hence the words "more or less" - plus chaos theory - which you really, really don't need to invoke in this context - wouldn't result in systemic, structural inequality - just individual differences.