Called me out, eh?There are others here who may be able to answer better, but I believe @pais alto explained that, when air support is halted, quite often the ground crews can't do much.
Unauthorized drones don’t shut down ground operations, just air ops. But that means these things are halted: aerial reconnaissance and intelligence (you just can’t see nearly as much or as far out ahead of the fire from the ground which affects prioritizing and planning), logistical support (helicopter personnel transportation and resupply of equipment, food, and water), and of course tactical support of retardant and water drops from helicopters and air tankers.
So, safety, effectiveness, and efficiency are all affected. Ground forces can of course get by without air support, but as a rule of thumb if there are drones around that means the fire is near development and people, and by definition that’s high-risk and high-priority for fast and effective firefighting.