There's also a different integration of skills. Knowing how to craft a reliable spear, how to operate it efficiently and how to lockdown prey to aim at is a serious set of skills. It's just not categorized as such in our era but its a blend of primitive mechanochemistry (glueing and tying sharp rocks to staff with ropelike fibers) merged with advanced survival Olympics and 24/7 without much of a safety net. All of these require more depth of focus than what most of us do on a daily basis.