We do need testing.
I personally love living in a state where end products are tested. Having that to inform my decision helps a lot.
And we also need more medical testing. I for one would like to understand why cannabis does the things that it does, which is something that is only partially understood. And more testing will lead to more illnesses cured.
But I agree that we know enough at this point to say that “cannabis is medically useful” and that it shouldn’t require more testing to reschedule/legalize...