Again you people don't get it. All firearms are treated as if they are loaded regardless of whether or not they physically are loaded. If you handle your loaded firearms in a different fashion than unloaded you are wrong. As I mentioned, safety devices(mechanical) are simply insurance for the unplanned fall or tumble one might take.
"visibly safe" is an ignorant square range belief that contradicts the fundamental rules of firearms handling. The "practical" side of a single shot BA rests squarely in the belief that "showing clear" is somehow a time based operation where faster is safer.
As for the ride down the embankment. Control of the muzzle and finger off trigger solves the problem(a mechanical safety is a nice addition). The system involved is irrelevant as the fundamentals for firearms handling don't change. Hence why the four rules are UNIVERSAL.
Crossing a fence line is not rocket science. For those who are uber paranoid or lacking in skill, unloading your firearm is the safest way. For those with some intelligence, laying ones rifle down pointed in a safe direction and hopping the fence produces the same safe result. Firearms don't discharge themselves. If you hunt with a buddy(which smart people do for safety) handing your rifle over the fence to your buddy is no different than walking the bush with it. If you can't do one safely you can't do the other. Again, muzzle control and finger off trigger solves any problems that could be possible.
I guess the term useless is a little inappropriate, let me clarify. When another style/design can accomplish a similar task with increased speed, ease, or efficiency. There is no logical reason to select the inferior style. Hence it becomes less useful, perhaps useless when compared to the superior design.
TDC