The third level of opposable thumb

What sets man apart is the opposable thumb. Man can grasp or pinch.
But that’s not all of it. With your hand you can grasp something. But you also need two arms, or more specifically two sets of pincers so that you can operate on something while holding it in place.
For example unscrewing the top off a jar.

But that’s it?

Why isn’t there a third level of pincer that allows you to hold a more complex thing in place while holding a simpler thing in place while operating on a third single part.

The answer I assume would be, “because two is good enough.”
It just struck me as odd that there are only two.

How many cool tools could we make and use if we had a third level of pincers.

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