I've been reading, and resisting the urge to say much here as I see both sides of this and I'm certainly guilty of cross-posting.
Be that as it may, it strikes me as there is a unwritten benefit to a lot of the cross-posting.
Examples:
I consider the threads such as 2022 landscapes, bird portraits, etc. to be community threads of sorts. There is a lot of sharing and from time to time a lot of discussion. I suppose I would consider threads of that type to be the MAIN image sharing threads. Before it is said, yes I understand not everyone shoots landscapes, and I'm sure there are threads for other topics that would fit this definition.
Lens sample threads: I consider those to be for research for prospective buyers as much as anything else. Where possible I have nearly always cross-posted images to those threads, so that people curious about the lens in question can see images from those lenses. I've used them myself in that way. I don't see these as threads where people "hang out" so to speak.
Lens body threads: To me they seem to be a mix of the two, both as examples of what a camera body does..and also a place to exchange information with other owners of the body in question.
Without mentioning names, I can say that I receive private inquiries about lenses and bodies asking various things about them. Why private I'm not sure, but it doesn't matter I'm happy to provide whatever assistance I can.
There is a time and place for everything, and I think it is very difficult to assign hard and fast rules to activity such as this. As Jake mentioned, you risk alienating significant contributors to this forum over the years by being too stringent either one way or another. Seems to me posters should just use their best judgement as to whether cross-posting an image is appropriate or not. It won't always be in agreement with other posters, but so what? It's not a life and death matter, assuming it is done in such a way as to not encroach on the forums IT resources as Pekka outline. We are all different in our perspectives, that's part of what makes a "place" like this successful in the first place. Warts and all, I've seen this forum thrive for the most part, when many others like it have fallen apart. I'd be careful about tinkering too much with something that works. My $.02.
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