[ramblerman]

This kind of nitpick seems a bit unnecessary, and I think it's particularly strong because people are contending with intelligent design nonsense.

When you talk generation to generation, the gradual tiny mutation each time did indeed allow primates to grab the branches a little better and so they had a higher rate of survival and the causation matters.

But when you talk about the end product (the hand), it is fair to say that primates (as the product of those millions of tiny iterations) evolved to better grab branches, imo.