I think there are two arguments here: legality, and actual safety. I would argue that the slow rolling stop is perfectly safe in all cases, but the law exists as it is only to reduce ambiguity for enforcement. It's not a calculated risk - there is no circumstance where it's unsafe.

In the UK stop signs are rarely used, they are in places where visibility is so poor approaching the junction that it wouldn't be safe not to stop.

There are definitely places where it isn't safe to roll through a stop sign, unfortunately in the US the system uses stop signs as a kind of traffic calming measure so then there isn't a clear way to mark the places where stopping is absolutely needed for safety. Of course in theory drivers should be able to notice the lack of visibility and drive accordingly but in practice the hazards can be somewhat subtle and many drivers have poor judgement.

Given your nick, do you happen to know of a map where stop signs are plotted? I can't think of a single stop sign in my city..

It is definitely unsafe to enter an intersection where visibility is compromised by an obstruction, hill, or curve. Rolling such stops is dumb even when you don't see anything to stop for.

> there is no circumstance where it's unsafe.

Famous last words