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From the perspective of a hunter gatherer, we already live in this future. Our skills have nothing to do with theirs. From their perspective we are phenomenally dumb because we couldn't survive very long in the wild, and know very little of our natural surroundings.

In fact you can argue natural pressures have stopped us from evolving. We don't need our logical skills anymore to deduce the tracking and pathing of animals we hunt, or our memory to remember where the berries are.

We're not worse at remembering numbers, there's just no need for it so we don't bother.

i think what people memorize has been made optional, but that people still memorize a lot. sure not phone mumbers, but the amount of lore they can recite from some fandom seems to be of similar depth