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There's been academic studies on this. The average hourly productivity as measured in lines of code for professional developers is very low. Along to order of 1 to 2 lines of code per hour. This is because of all the other communication and synchronization that you mentioned that needs to happen.

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There are also those times when I write something that technically works in 45 minutes, but it’s 40 lines, but spending another hour or two on it gets it down to 4 lines. The shorter my code, the longer it takes to write. But it’s easier to read and maintain, while also running faster.

This is one reason why lines of code is a poor measure.

That's a decline. It was 6 instructions per hour when Brooks wrote "The Mythical Man-Month" in 1975.

New languages are so much more expressive.

Would a line not contain more than one instruction, on average?

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