I understand that the artwork must come from the specific edition, because they are often different on special, limited, and promo releases. And after some years, it is hard to tell which relase had which cover. Vinyl covers usually have slightly different composition with smaller titles and logos. I have voted for removal of one such misplaced artwork. (The other site mixes artwork up all in one group together with 'remastered' pictures.)
But the cropping is like a different viewpoint of the same object. I can accept that the rectangular "preview" image would not reside in the first slot. But I'm shocked to find that it has not place at all among up to a dozen images found under a release. Also, when an entire release group is viewed, the picture shown for it is not representative of any particular physical object, buf of the song / album as a whole. Why would it then have torn off corners?
These rectangular pictures for slim cases look good to me, although if they had detail near the edges, I would definitely choose my less cropped versions. Enigma 1 Enigma 2 The picture of the disc is also permitted to exist in a foreign tray.
I once uploaded a "mockup" image from Audio Fidelity, which they have on site for preview purposes, and a user disaprove of it, and asked for a scan to be put in the first slot. Later it was permitted to exist because it was an official image. A picture with filled in corners differs a great deal less from the full view of the box than those mockups do.
And how is it that Digital artwork of modern pop music is permitted to exist for CD medium, when the pictures were obviously not sourced from CD... Grande 1 Grande 2 Grande 3 Grande 4
Resolution attainable from a CD cover is in slot one, while digital artwork is further down below. Grande 5