I remember when I raised this point like a year or two ago -- in response to someone saying that coding AI made all their work trivial I said something like "if you have multiple agents the work changes and becomes more managerial - don't you think that managers contribute value" and I got a bunch of downvotes and all the responses were like "no manager has ever contributed value." Ahh, good times.
"Managers" don't contribute much if any value. Someone with creative vision contributes value. That cam be a PM, or the right engineer, and sometimes both if you're lucky. Most of us aren't lucky like that.
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As an engineer I've found most managers that i ever worked with to be perfectly fine people and their role was justified and I was happy that their job was not my job.
By most I mean maybe 75%