Also to draw a slightly more relevant comparison.
If your a trained mountain climber your able to move up and down along most vertical surfaces.
That does not mean your allowed to climb up and down public buildings or monument.
Because public order and stuff.

Flying is then even more risky. We could even assume flawless flight on hawks level.
Enough to let you fly and text at the same time. Like a lot of idiots already do while driving.
And when you then drop your phone, or your soda from 30 meters height, then it will kill or main the kid below.
Thats why flight need to be extremely restricted.

All the same. I do think the quirk laws are still a little -to- restrictive.
Even if they by default is needed. But i mostly think it showed in the Stain incident.
We have a serial killer, who decided to attack with a lethal weapon even after being warned off.
It should absolutely come in under self defence to use a quick then, no matter how untrained.
No matter if it had blown Stains head clean off, or turned him in to a paperclip.
And it should have been medals all around, no sweeping stuff under the carpet.