The same way niche/luxury product and services compare to fast/cheap ones: they are made with focus and intent that goes against the statistical average, which also normally would take more time and effort to make.

McDonalds cooks ~great~ (edit: fair enough, decent) burgers when measured objectively, but people still go to more niche burger restaurants because they want something different and made with more care.

That's not to say that an human can't use AI with intent, but then AI becomes another tool and not an autonomous code generating agent.