Of course, as you allude, the US is a large and diverse country too, where those features may or may not apply in a given locality.
I suspect, though, that on both continents, when we’re talking about these problems with the dual staircase requirement in this context, we’re talking mainly about relatively high-density developments in space-constrained urban settings.
If, as the article claims, we’ve arrived at comparable fire fatality rates under the two policy regimes, it does seem like their prevailing standards neatly capture a tradeoff: it seems like you can add safety either by socializing a fire response infrastructure capable of quicker response, or you can privatize that extra margin of safety by imposing these second staircase costs on individual developments. I’d be curious how the total costs add up, I’m almost inclined to donate to the guy’s nonprofit just to get the answer to that.
I’d be curious how these changes would affect the economics of apartment blocks on huge greenfield suburban tracts, where parking requirements rather than staircase requirements seem to be the limiting factor space-wise. I’m thinking of the kind where space is cheap enough that they do surface lots rather than building parking decks into the structure. It seems like they tack exterior staircases on the edges of the building at not too much extra cost in those situations, but I suppose the floor plan implications must still come to bear.