My understanding is building code primarily focuses on (1) primarily keeping occupants safe long enough to get out of the house (e.g. material must have a minimum fire resistance duration) (2) keeping emergency responders safe when entering a house fire (e.g. stair hand rails cannot be open to avoid snagging fire fighter clothes or hoses). Once these two tasks are done, the code doesn't really care if the house burns to the ground.
Further, these codes are often the reference base used nationally. They're a reasonably safe base, but different location may add more requirements.
The Wildland Codes are specifically for wildfires, which burn longer and more intensely.
Not baiting. You can compare chapter 7 to the CA wildlands code and see the dramatic difference in fire prevention. As others have pointed out, the newer construction made under the code you are referencing are still burning to ground.
