These are usually meant for shorter buildings, and I imagine the staircases are all concrete and can't catch fire.

That being said, if you're in a multi level building and it's only a handful of levels, you should have a window escape ladder as the fire could be just outside your apartment, or in your apartment blocking the door

Maybe they should even be included, a 4 story, 4 units a level building would only be 16 ladders to provide.