I think we’ve just really evolved to be that way. We leaned into our bipedalism for persistent hunting so we could outrun our prey which is honestly fairly smart. “Survival of the fittest” seemed to really be based in our intelligence. Also due to this reason that we were always running, we didn’t need hair to protect our what was then pink skin as much anymore. When we really began to run, we’d sweat bullets which would cool us off, whereas we needed our fur in the past to actually protect us