Canada

That's a very simple view. Most of western Europe and Asia have higher fire safety than Canada and have plenty of single-staircase buildings. These kinds of decisions are not made based off a single YouTube video. It may be a source of public awareness about other approaches, but that's only the springboard to get feasibilty studies and expert consultations underway. There are external fire escapes, mandated sprinkler systems and other ways to improve fire safety which alone will likely prove far more effective than double staircases.

There are many valid downsides to our outdated fire standards in Canada—many that introduce their own health impacts in other ways. And I wouldn't quite consider a fire chief to be the ultimate expert here. Sure their input is important to have, but I also want to hear from architects, standards bodies and academics that study building design and safety.