I'll just note that laws and regulations can get struck down for vagueness. If there's no hard rule about what kind of drones are regulated how, then it becomes more burdensome- or even impossible- to know whether you're complying with the law.
Or the intensity of enforcement varies in the first place.
And chances are you’re doing something else illegal anyway.
Or can be followed until you do.
And if you don’t, there’s always the routine traffic stop.
someone has to decide which cases to bring, unless you fund the police and prosecutors so they can bring every plausible case, which sounds like a strictly worse universe to live in. Is this discretion abused? Yes, all the time. But bringing every case seems more like a police state than a free society.