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Sram Electronic/Hydro kit have only two options (flat and post mount), sold indeed in distinctive box, while chainsets and cassette are three each and considered add-on, all cross compatible so it would make it impossible to offer a package with all these options.
Shimano doesn't care and doesn't sell full group sets, it's up to retailers to find individual parts and offer them online as a complete group or di2 upgrade kit only.
I agree though, it is annoying that shops use pictures of complete AXS group sets when they are only selling shifters, brakes, derailleurs, batteries and charger.
I see. Interesting. Not entirely sure what the point of any of it would be without the mechanical parts at this juncture.
Retailers also seem to simply dump any picture of the group set as the leading image.