My napkin guess is that this is some sort of specific process/tactic, either it only allows 1 2 levels of reclassification at a time or that was all that could be agreed on (with multiple agencies, likely the DEA limiting the pace). So either avoiding the Senate or the tiniest of steps that pretty much anybody will allow/defend. Slow-and-steady could be the plan, assuming Biden wins again and actually follows up.
Well that and it probably really helps with the turning-a-blind-eye, like the difference between ignoring/acquitting a hit-and-run fender-bender versus ignoring/acquitting the act of treating a no-traffic intersection (in clear conditions) like a 4-way stop. Maybe it will be enough to reduce hostility and move the relevant overton window over time while avoiding pushback.
EDIT: Looking at it more, this seems to be the department of HHS pressuring the DEA on clear medical use. As others say, the lower restriction might help further medical study which could in-turn result in further reclassification.
If potential is key, I say keep the context of the MAID process but instead of outright death make it cryonics. Plus other potential relevant volunteer stuff and organ donation stuff lined up. Even if the initial cryonics technique is not even close to viable, other stuff could be transformative. If cryonics has any chance to work, things will get appreciably better in 300-or-so years right?
Hopeful worst is my brain in a jar mostly playing VR and sometimes knitting yarn via robotic arms. Lots of ways it could be better. Also unlike traditional cyborg stuff with all-machine life-support, I would like to still have a complex microbiome if not taking it further with symbiosis.