If it is something that "shouldn't really be done", then it should either be expressly permitted or prohibited. If people use common sense then you wouldn't enter, say, a park if there were already a lot of people there. But limiting you from seeing, say, both parents at a time isn't going to change the risk of spread of this infection is it, because if you are a carrier and pass it to one person from a given household then that person will pass it to anyone else in their household, whether or not you saw those other people yourself.It’s neither nonsense or pointless.
Limiting to two people is to reduce the total number of people gathering in these green spaces.
Again, common sense. Just because you are permitted to go the park with somebody doesn’t mean you should automatically do it, never mind doing it every day.
People need to take personal responsibility.
If common sense was being utilised here, then you would be allowed to sit in your own garden with a friend or family member from a different household. Why only allow people to meet in public places? How does that reduce infection risks? It doesn't...all it does is allow the police to wander around handing out penalty notices to recover the revenue that they are losing from less people committing road traffic offences because it's far easier for them to do that in a park than it is to check everyone's gardens.