Well, for one thing, the 2018 Farm Bill legalized hemp derived cannabinoids, not cannabinoids from marijuana, or any other source, including GMO yeast.
For another, IMO, the FDA will likely consider all or most cannabinoid isolates to be drugs like Epidiolex, so no go in food or dietary supplements.
Additionally, I'm not sure what you mean by CBG being "clearly better" than CBD. Better at what?
You used aspirin as your analogy, and you were right to do so, as it is a drug. It's an OTC drug, but drugs are not allowed in food or dietary supplements.
Could GMO Yeast derived Cannabigerol isolate become an OTC drug? Maybe, but that would be years away.