Mind you that my take and experience is specifically in the context of security.
I struggle to make the parallel that you suggest (which might work for some areas) with a security engineer.
Say, a person learned to brainlessly parrot that pods need to have setting x or z. If they don't understand them, they can't offer meaningful insight in cases where that's not possibile (which might be specific), they can't provide a solid risk analysis etc.
What is the counterpart to this gap? Because I struggle to see it. Breadth of areas where this superficial knowledge is available is useless, IMHO.
But those are absolutely not the only 2 levels. Server rental can be managed easily by the same infra team who manages the cloud, for a fraction of cost.
I will say more, the same exact team that spends time managing EKS clusters could manage self-managed clusters and have money to spare for additional hires.