I think a lot about communication, especially as I'm currently working in a team of size one.

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The main thing I think about communication is how *expensive* it is, especially synchronous communication.

And this isn't "meetings are expensive". Literally all communication is expensive. It takes up a lot of time, and unless you're very careful about your team topology that time grows quadratically in the number of people in the team.

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The benefit of adding people to a team is rarely that it improves your efficiency: All things being equal, a small team will outperform a big team at a task they are both capable of achieving.

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The big difference is that a big team is capable of achieving many things that a small team is not. Either through sheer amount of work they are capable of doing, or through the fact that they represent more skills than small team can have.