I don't get it either
When I first got my Duet a few years ago, common sense told me to leave the door cracked, so I did. I have NEVER had any smell at all. I don't use fabric softener but white vinegar instead, also powdered he detergent. I do notice on my Duet that, even with the detergent tray pulled out and left out, the holes (inside where the detergent tray inserts, where the water comes out) have a pink look in them. I got bleach and wiped them down, but this happened EVEN with the detergent tray left completely out! There is no smell in my washer though. I think another thing people need to do is take the detergent tray out. It holds water and can't really breathe if pushed in.
I remember we had a brand new whirpool TL washer in 1989 and the thing stunk and I could not figure it out