It's politics and optics. But as someone taking a schedule 3 medication that is really a schedule 1 in disguise (sodium oxybate) I wonder why they couldn't use the same tap dance for psylocibin or MDMA. Slight chemical modification to adjust absorption rate but same active ingredient. I think we only get away with this because it's prescribed so rarely and out of public consciousness. It's incredibly effective at treating a pernicious condition.
I think the Analogue Act covers stuff like that?
https://en.wikipedia.org/wiki/Federal_Analogue_Act