This is true and interesting, and I'll add something: When you mix the teams, low-IQ people get to learn from high-IQ people, and they end up getting most of the way to the performance level of purely high-IQ teams.

In the game world, this is suboptimal for the high-IQ. In the real world, it's good, because the pie isn't fixed and more people working on things leads to benefits for all. With specialization, however, it's unclear to what extent this IQ-mixing-training benefit shows up.

But orgs hiring people also plausibly get most of the IQ mixing benefit via explicit trainings.