I'm pretty sure there are plenty of fields where the output of your best and worst employees don't differ dramatically. Worst is generally some passable minimum not someone who refuses to do the job entirely. For plenty of assembly line jobs, your worst employee has similar productivity to your best employee because there is no ability to make the assembly line faster for the more productive person.
In code on the other hand, your best employee can straight up do things your worst employee can't. The differences are much larger. There is a reason people hire Principal Software Engineers, but most IC roles in other fields don't have the same range of seniorities.
In code on the other hand, your best employee can straight up do things your worst employee can't. The differences are much larger. There is a reason people hire Principal Software Engineers, but most IC roles in other fields don't have the same range of seniorities.