That’s bullshit. That’s a nanny state leftist authoritarian argument.
Authoritarianism = Obama, Biden, Bush etc. That’s not freedom. It’s evil.
The best but wholly unsatisfying compromise is to restrict the growing of and access to recreational marijuana where it is legal so as to inhibit large scale, unregulated grow operations that are conducive to illegal trafficking. Or, one can imagine a comprehensively regulated marijuana industry with the growing and sale of marijuana otherwise illegal.
If one thinks the issues through, schemes of partial and patchwork legalization for marijuana require more not less regulation and policing if they are to have a hope of working as claimed. One gets the sense that many advocates of such measures realize this and expect them to prove so expensive and problematic as to be little more than halfway measures toward full legalization.