Embedded media (images/video) can contain objectionable content and there are some situations where moderators would like to give their users ability to post them, but only if they pass review first.
I would like to propose a new site setting,
review_media_unless_trust_level (or similar). It would default to TL0 which is the equivalent of disabled by default. Admins could then set it to TL1 or higher, and if so, any posts with embedded media would end up in the review queue before being posted.