Every communication medium is necessarily an abstraction of a thought, images are at a higher level and this can increase the gap and lower the signal. Then I guess AI generated visuals, beyond often promoting users lazyness, inject some elements that are not contained in the original idea, and this make the transmission more complex.
Nostr puts togher a protocol and an simple open format; this makes possibible to create and upgrade a personal self hosted web sites, on a custom domain, using Nostr as a storage backend, promoting a "content first" phylosophy but letting the user also express himself on the preferred visual presentation (layout, colors, typography, etc) under his brand name without locking in a specific framework. This anti-locking attitude expresses itself to the point that someone else in the meantime can also access, save and broadcast the same content using a different client; so the content - if valuable - can actually survive not only a censorship but also backup errors, the madness of the NICs, and in the end to the wishes of the user.
Back to images: I think images should be bundled with the content, and since *we're going to pay for the hosted data* (otherwise we'll be the product, right?) a natural selection will emerge as to what a user will decide to publish and keep and what mark as ephemeral (ex. using an external url or a new kind). I'm not at all concerned about a 200KB *whole signed* article incorporating 2/3 useful photos or a interesting 10KB SVG graphic.
Would you like to store a 1MB meme gif forever? Pay for it, I will decide if pay my bandwidth to download it.
I love words but I think it's wrong to divide textual and visual content with the aim of making Nostr "more efficient", this implies that we consider visuals expendable garbage, and therefore users will produce expendable garbage. Ask for value to manage a (visual) content and it will express a value, as PoW teaches.
Just random thoughts, lots to think about and polish. Maybe I'll write something about this when I have a clear vision.