From what I've read, they are pretty fire resistant because they are dense and so will char and burn slowly. There have been a couple articles on here in the last couple years about "wooden skyscrapers" and they have made that argument.

I think wood can be quite fire resistant even with traditional modifications like charring. And it may retain structural integrity better/longer than steel. I think steel can become an enemy in a fire quite abruptly.

Chicago allows mass timber buildings up to 6 stories, although a developer has proposed an 80-story mass timber building. So that guy may do all the work to open the door.