[s1artibartfast]

I think that scales very much with the complexity of the task.

If you are talking about someone who cant server coffee, the balance is clearly in favor of poor management over inadequate skills and trainability.

If you are talking about very specialized skills like aerospace engineering, I think the balance can move further in the other direction.

There is also the combination of the two, where in the interests of growth or cost savings, an organization has cut corners on the quality of talent hired.