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As sibling comment hints, you have multiple concepts mixed together.

The monkeysphere is "how many people you can comprehend as people with their own full lives", and is on the order of 150-300.

"Critically important" in your life is a far higher bar, so 10 to 20 makes sense.

"Playing field" is a far lower bar where only the relevant metric matters, which widens the range to a far larger number of people.

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