Fluid intelligence is a valuable characteristic for engineers, but so is experience. It's great to be able to learn quickly and react to a changing environment

Fluid intelligence is a valuable characteristic for engineers, but so is experience. It's great to be able to learn quickly and react to a changing environment, but it's also great to be able to draw on past experiences to predict and preempt future challenges. What isn't great is a lack of variety. Why would you want everybody on your team to be the same type of person? You want everyone's abilities to be complementary, not identical.