Lacking Drop Safe design elements does not mean that when dropped, it will discharge.
Six shooters were so notorious for discharging when dropped, therefore an empty chamber under the hammer was the norm.
There is no documentation of any 1911 that discharged from being dropped.
Leverguns with half-cock were in use safely for over 100 years. It's possible they could land on the hammer, break the sear and discharge.
Less likely in shotguns with no exposed hammer. But my feelin' is that my familiarity with the safey has the most to do with whether to store one chambered.
If I feel that I might not recall immediately where the safety is located, I store defensive shotguns with safety off, unchambered.
Might be faster to pump an' fire than to fumble for the safety.
Definitely, unload before climbing over or through fences.