I was gonna say, Serious Eats talked about this method (starting with a boil and then cutting the heat, mentioned in the article but not in the comment) so many years ago; only that they didn't call it "passive cooking". It comes with the nice benefit that you'll never have to worry about the pot boiling over except during the first minute, and, from what I've noticed, it seems to better align with the suggested cooking times on retail packaging.

I've argued with people about this and could never convince them to try it, mostly because of the "grandma did it this way" reason.