Jamming is not as useful as a targeted attack, so this still seems like a defect in the WiFi spec. For example, an attacker may wish to keep their network work

Jamming is not as useful as a targeted attack, so this still seems like a defect in the WiFi spec. For example, an attacker may wish to keep their network working while disrupting others (there is an example of Marriott hotels doing this linked elsewhere in the comments here).