One very important thing this does is get rid of a really glaring error. As a Schedule I drug, Marijuana supposedly is completely useless, its only role is as a potential danger and that's why nobody must have any - except, we've known for many years a bunch of people find it useful as a therapeutic drug, so that's clearly wrong and the Schedule I status is an error. Perhaps there shouldn't be any Schedule I drugs at all, the idea seems misconceived, but certainly if there are Schedule I drugs, Marijuana doesn't belong among them.
Meanwhile in Schedule III it's a judgement call. Schedule III drugs like K or steroids are drugs we know are useful, your doctor can prescribe them, your hospital pharmacy has them, but we also know they get abused. That sounds much more like marijuana, and, to be honest, alcohol. Can we justify Schedule III for Marijuana and yet not for Alcohol? It's at least a serious question whereas the Schedule I status was just nonsense.
