"... no one knows how it works."

That depends on the definition of how. Our conscious decisions demonstrably direct our bodies to act. The decision to be well is responded to by our immune systems, although how that decision recruits the immune system is poorly described, if at all.

"Medical tests have to account for the placebo affect (and the nocebo effect)."

No, that's not anything to do with medical tests. Tests don't determine why the metrics are what they are. They only determine what they are. Doctors interpreting tests have to account for psychological impacts when considering the metrics medical tests interpret. That is not up to medical tests.

"A tincture works almost as well as the medicine."

I really wish you'd spend a few minutes editing, because I think this statement is a result of lack of editing, rather than misunderstanding. As you point out, many 'medicines' have egregious side effects that results in them working less well than tinctures and other herbal remedies, not better than them.

"Crystal healing is a thing."

Zero evidence for this exists. Nothing but placebo effect. Are you wilfully just parroting wishful thinking, or do you have an actual interest in facts?

"...only treatments are allowed."

This ignores the actual cause of the failure to cure cancers. Only PROFITABLE treatments are allowed. CURING disease isn't profitable, when highly profitable treatments are only sold when disease continues. The CIA has been outed recently for keeping the evidence that cancer and parasitic infestations are both treated with antiparasitics, because antiparasitics are far less profitable to pharmaceutical corporations than (often deadly) cancer treatments.

That difference matters enormously. Being specific about evidence and statements of fact regarding them is useful to people. Dandelion root, bioelectrical communications, and cannabis have all demonstrated curative utility when they are used to treat cancer. Those are treatments that cure cancer(s), and aren't provided by pharmaceutical corporations maximizing their revenue by selling other treatments.

"The body merely needs a signal to tell it that it has permission to heal."

It needs the RIGHT signal. 'The tincture' is abysmally vague. Dr. Michael Levin has shown that cancerous proliferation can be eliminated by restoring the bioelectrical network connection of cancerous cells to the rest of the body. That is the right signal, and 'the tincture' being a vague generalization, isn't. I'm NOT saying specific tinctures can't help in specific circumstances, but I am saying that a bit of rigor is necessary when discussing existentially important health issues. Please do exercise that rigor I know you can.

Thanks!