Every time personal screenshots as housing decor comes up, the same reason shoots it down.

SE will never, ever let us do it because they do not want to have to police people's art and make sure there is nothing lewd/inappropriate. Sure, there are all kinds of restrictions and guidelines they could put in place to try to avoid it, but there are people out there who would abuse the feature and it's just easier for them to avoid the hassle by never implementing it.