Simply put, control. Lightroom is a photo organizer and image catalogue tool, but it is reactive not proactive. Try deleting a photo using Windows File Explorer. Lightroom simply ignores it. DPG will ‘red flag’ that immediately, giving you the all important second chance to recover the image before it’s too late.
DPG warns you if your backups are not up to date and the professional version will do the backup for you.
DPG easily integrates with all the photo editing tools you use.