I think that’s largely due to the weird notion that engineers will eventually “upgrade” to management, as though one is the advanced version of the other.

There are whole degree programs dedicated to managing and organizing people, but we’re like, “nah, Joe’s a good programmer so we should talk him into stopping that so he can supervise people instead”.

Fact is, there’s little relation between the two. A person may happen to be good at both, but expertise in one does not imply adequacy in the other.

Not every programmer can be a good manager, but no non-programmer can be a good manager on a programming project.