Research on cannabis in the US has been severely restricted due to it being federally illegal. Cannabis that is grown for research purposes is in extremely poor quality, which naturally does not yield accurate results when it comes to studying the effectiveness of cannabis as medicine.
Now that we know we can turn yeast into cannabinoids, we can bypass the restrictions on growing cannabis and produce enough cannabinoids to conduct unlimited amounts of research.
We may finally understand all of the things the cannabis plant can do.
This could lead to advancements in the field of medicine, and help expedite full legalization/decriminalization.