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"Managers are an organisational necessity past a certain scale." That sounds like a dubious claim, I'm sure there are exotic ways to run an organisation that doesn't need managers.

For example, Pirate ships ran with a Battle Commander, Accountant and Crew.

[pkd]

Pirate ships frequently had crews of about 50, and the biggest ones never exceed a couple of hundred. Do you have real world examples of large organisations (in the thousands of employees) being managed in a flat hierarchy? Because I don't.

Please note I'm not saying you can't be overprovisioned in managers. I'm replying to the parent comment that sees no need for managers.