Why is lots of little commits a problem? How is that evidence of optimizing for commit count as opposed to lots of people submitting PRs to cover low hanging f

Why is lots of little commits a problem? How is that evidence of optimizing for commit count as opposed to lots of people submitting PRs to cover low hanging fruit? What does optimizing for commit count achieve for anyone? In what context does "lots of commits" gain someone enough value to optimize for it?