What's the point in class Aing it when effectively you legally bribe the police with a cannabis caution anyway? The ABC system isn't based on how harmful a drug is like people think but IMO the amount of medical Vs recreational use it has. It's more policitcal than anything.
Eg, testosterone, benzos, pregablin, Ketamine are all widely prescribed (class C) than say mushrooms, LSD, mdma, DMT that aren't something you see prescribed (class A) although there are prescription opioids that are class A but that's due to the fact they are incredibly addictive.
From a health perspective they should scrap the system and build a new one ranking drugs based on harm to the user and society as advised by Prof David Nutt.
Making cannabis more illegal / class A would probably make it more difficult for it to be researched and prescribed. Dr Strassman (USA not UK) who wrote the book DMT the spirit molecule stated that the illegality of psychedelics made it very difficult to legally research the drug to understand psychosis and why we have the compound DMT present in the human body and why does the pinal gland secrete it during death on rodent models? After the 70s it became almost impossible to get permission and go through the legal processes to have the drug manufactured and approved. This is one reason we have a huge blank space of research since the 70s-now but ONLY now people who've been using these drugs medically ie microdosers are gaining some pharmaceutical interest.
I do think smoking cannabis daily for a lot of people demotivates your drive in life, when I'm stoned I don't wanna do a single thing, which is why I dislike cannabis myself and would advise people to take into consideration who use it. It's not like being balls deep in a trip. I do however think cannabis has medical benefits and should be available.