I've managed some incredibly prolific developers and some very slow ones, and the prolific ones are pretty much always the ones more available, more willing to fix things, more willing to take feedback.
And also: they make less mistakes because their skills are sharp. This anecdote comes to mind: https://austinkleon.com/2020/12/10/quantity-leads-to-quality...
If you have to constantly rationalize performance differences by demeaning others, this says more about you than the prolific people.