Your words keep being 'well no, but actually yes.'

No, you're being overly reductive. For example:

if there's an "only" then that's "the wrong drugs,"

That strongly implies that argumentation here is subjective. It's not, it's based on objective measures, such as harm to non-users. The current law is objective, but stupid (based on usefulness in medicine).

Your arguments are overly reductive.

You do precisely that's with your argument re: MTX (MTX is bad so it should be banned). Your strongest argument is, "it's addictive." Should we ban everything that's addictive? (e.g. food, sex, work) Or only things with a financial consequence? (e.g. stock trading, extreme sports) Or only things without a physical good attached? (e.g. digital books, digital video games) Or things with a manipulative aspect? (any form of advertising, time-based exclusivity, etc)

What exactly is the objective measure you're basing the ban on? Why doesn't that apply to other, similar things? It sounds like your argument is, "I don't like it and I (or a friend) have made poor choices, so it shouldn't be allowed." Yeah, banning it will probably help some people, but that's very much "the ends justify the means" logic, and therefore invalid.

The alternatives are still super duper capitalist, so you can relax.

I don't care if it's capitalist, socialist, etc, I care about use of force. You need a very good reason to prevent me from doing something, as in, it would violate someone else's rights or would likely cause someone else to violate another's rights.

The economic system isn't important to me, individual rights are. I actually don't like capitalism much, but it has so far done a decent job of preserving self-determination. I also believe a lot of people will make stupid choices, so I also believe in a social safety net (something like UBI, addiction recovery programs, etc) so people who have screwed up have a way out. But I'm opposed to the government making choices for me.