Well let me begin by saying I actually wan't joking about the mail ordering only system (although it may have appeared to be so).
It addresses many issues. Not least of which would keep users off the road while under the influence. And I'm not talking DNM shit here or Cryptocurrencies or any other underhanded stuff. Could be managed on the exact same basis as pharmacies (here anyway), due to the pandemic, push to keep people out of their premises and to rather order online and have medication delivered (exceptions being the higher scheduled stuff e.g. Fentanyl).
But I dunno. For every idea that comes to mind: there's a drawback (usually several).
This really could be a study in and of itself. I reckon you have to first work out in detail exactly what it is that you're trying to accomplish, then design the perfect system assuming a perfect world, and then start pulling it apart piece by piece to see if it all holds up and where the weak links are in the chain and try address them. And while this may seem obvious to most: I wonder.
Maybe best case scenario can only be the lesser of any number of evils. Again an obvious statement I suppose.
In just going through that site yesterday though: so far as I can tell anyway the biggest issue of all that I can see, before we even get to the nuts and bolts, is the UN and associated bodies etc. Not to mention political will. Bearing in mind that we're talking about full legalization here i.e. not just decriminalization for possession or for personal use. And which does beg a question. In spite of the apparent ongoing discussions and softening stance on medical use of Cannabis: it still remains "categorised internationally alongside drugs like heroin and cocaine.". And that's of December last year. I don't have the knowledge or experience or expertise to square this all away to be honest given that quite a few countries, as we know, have gone their own way anyway.
transformdrugs.org
transformdrugs.org
Be real nice if somebody in the know (hint hint) would chime in here. I'm just playing guessing games and putting out hypotheses that could be totally off of the mark. I'd find it a stretch to believe that this site is not known to them. And, let's be honest, the overwhelming majority of members here would be affected by all of this, have an interest in this, and are, dare I say, the target market really.