BTW, another reason why the other clients should support your approach and have NIP-94 embeds/previews in notes is because it makes it much easier to fight CSAM on Nostr. Once a credible authority has said that a particular image or video is CSAM - instead of just having a URL, there's now a hash that can be checked in the future so CSAM can be taken down even before it's reported.

And just in general it allows relay owners to take down content they've disapproved in the past immediately instead of having to wait for it to be reported. Not saying it'll work perfectly, but it's better than the current situation which is a bad game of whack-a-mole.