Reminds me of an old gag: "if you ask ten lawyers for their opinion, you'll get at least eleven opinions". You would hope that pilots have a more uniform view on things, but if threads like this are anything to go by it's pretty clear they do not.
"Reasonable" in a legal context is one of those wishy-washy words that gets put in when someone who should have known better couldn't be bothered to determine where a suitable boundary lies (perhaps with good reason). It's basically kicking the can down the road to those who decide they are going to test the limits of the boundary and, ultimately, to the courts when things go wrong. More cynically, it's a politician hedging by placing a vague boundary line of what is acceptable because public opinion on the matter isn't resolute enough to let them risk alienating some of their voters who are more conservative/liberal by being more precise.
That last line, especially for a drone pilot in the current environment, should be a huge red flag. It means when things go wrong you are going to be tried in the court of public opinion and/or be at the mercy of a random court whose presiding judge may be having a bad day. You're certainly not going to get much sympathy from those who don't flout the rules and we are all are going to see even more restrictions and hostile behaviour from members of the public as a result. We're all in the same pool here; we need to keep the water clean and kick out those who deliberately do not, allowing that accidents and honest mistakes do happen.