The NYT article is one of the best explanations of the fire and the reasons why it wasn't caught sooner, and how close the cathedral came to being lost (the day of the fire everyone seemed to think is was lost, I kept trying to explain to people it was not).
As someone who works in architectural conservation, the system devised for the attic was idiotic. Any fire prevention expert can tell you that smoke/fire detection does very little if there isn't fire protection included. By the time the fire department arrives and is in position to fight the fire, the building is likely lost. Especially in a roof fire. That this roof was made of timbers hundreds of years old, hundreds of feet in the air and only accessed by narrow winding stairs...
So while people will focus on the mistaken location initially, which lost 30 minutes, the fire would likely still have been devastating even if the system had worked smoothly. It is possible the extra 30 minutes would have saved some of the roof attic, but very possible it would not. But they did cut it VERY close on saving the north tower, which would have been catastrophic if it had burned through.
Also on exhibit in the article, the skill and bravery of the firefighters. THEY were heroes that night.