Some people just really suck at character creation. All humans have the same base amount of stat points that they can assign. Naturally, some humans have invested in categories that are completely irrelevant and thus ruin their builds.
On Earth, any investments into branches such as mana (this obviously includes regen, storage, proficiency and so on) and mechanoids since they don't even exist here yet, are completely wasted.
Thus, some humans actually end up being better than others, even if that statistically should be impossible.