Even if we had perfect filters to accurately identify the best talent, there's not enough of the top few percent to fill all the spaces in the industry, so someone is going to be hiring mediocre talent or forgoing having a business.
In the real world, though, we don't have perfect filters, and churn has a cost, too, so in practice most places are going to derive value if they can make effective use of mediocre talent rather than just letting it increase their churn.
(Moreover, one of the effects frequently claimed from great talent, employed effectively, as noted upthread, is not just their own direct output, but increasing the yield from lesser talent; if you don't hire any lesser talent in the first place, you can't benefit from that.)
Even if we had perfect filters to accurately identify the best talent, there's not enough of the top few percent to fill all the spaces in the industry, so someone is going to be hiring mediocre talent or forgoing having a business.
In the real world, though, we don't have perfect filters, and churn has a cost, too, so in practice most places are going to derive value if they can make effective use of mediocre talent rather than just letting it increase their churn.
(Moreover, one of the effects frequently claimed from great talent, employed effectively, as noted upthread, is not just their own direct output, but increasing the yield from lesser talent; if you don't hire any lesser talent in the first place, you can't benefit from that.)