Files and regular wiki pages have little in common. Being trusted to upload files doesn't mean one is trusted to create new articles and vice-versa. Similarly, having the skill to patrol files doesn't mean one has the skill to patrol new articles and vice-versa.
Thus it is suggested to split the ability to patrol files (patrol-upload) from the ability to patrol other pages (patrol), and the right to have one's files autopatrolled (autopatrol-upload) from the right to have one's other pages patrolled (autopatrol). This should help to reduce the backlog of unpatrolled files on non-Commons wikis since more people will be able to be granted patrol-upload or autopatrol-upload.