I would love to just harvest once a year and grow white widow for example. But this s3ems not possible exactly for the reasons you mentioned.
That sucks, yes, but I can understand why. Is the law good? It is good enough. Will it need refinement? Yes, a lot.
They are walking a thin line. And if they overstep the EU could reverse that whole thing.
So, let’s run with it, and are what happens
Yes, the limit is per adult in a household