There are differences in law enforcement in the Netherlands and Germany. In the Netherlands the police can be advised not to enforce certain laws. In Germany this is not possible, if it´s a "Straftat" the police has to persue it! Only if it´s a "Ordnungswidrigkeit" the police can chose to persue it or not. That´s the mayor difference here and the upcoming law in its current version will make it a "Straftat" if you exceed the limit...In the end it is a matter of enforcement.
Probably police has no interest in checking your harvest. So if you harvest a few ounces, nobody is going to check it and it doesn't matter. It has no priority.
But this is a false sense of safety. Once they make it a priority again, they can hassle and bully every small grower with far reaching consequences.
This is basicly what happened in the Netherlands:
When criminal law is no longer sufficient for politicians and police, they do it through administrative law. And because all the regulations are applied fairly arbitrarily, they can be mismatched for harsh punishment policies.
Now nobody knows exactly what the rules and laws are and we are back to square one: re-criminalization and repression.
The system Germany is proposing has those same falling pits, politicians and law enforcers can bend it whatever way they like.