If a user doesn't have an OF account then they're not buying and/or leaking anything to begin with. Hell, they can't even scrape to upload to Coomer. Why cater to leeches?
Good tip on Ublock media element blocking, though. I'll have to see if there's a way to block pictures and keep video embeds.
Regarding images, you literally dismissed a user with one of the highest reaction scores on the site for suggesting that low-effort picture spam should be cleaned up. That makes you the one ignoring user desires, no? You also said yourself that similar suggestions about consolidating image posts have been made multiple times in this thread. Do you honestly think inactive users are posting suggestions here? Take a look at any thread with actual porn and you'll see that video posts earn more positive reactions than images, especially when they're PPV vids. I think it's pretty clear what users in those threads actually want, but you could at least take a poll.
And just to be clear on my image suggestion, I'd settle for some kind of opt-in setting to hide images, assuming Xenforo supports that. Even disabling notifications for image-only posts would be nice.