That's what I see when companies cut juniors as well. AI cannot replace a junior because a junior has full and complete agency, accountability, and purpose. They retain learning and become a sharper bespoke resource for the business as time goes on. The PM tells them what to do and I give them guidance.

If you take away the juniors, you are now asking your seniors to do that work instead which is more expensive and wasteful. The PM cannot tell the AI junior what to do for they don't know how. Then you say, hey we also want you to babysit the LLM to increase productivity, well I can't leave a task with the LLM and come back to it tomorrow. Now I am wasting two types of time.