I think I see what you're saying - but the thing is that it's exactly as you say - except that it takes years to know if the cure worked. If it did, then the body will fix itself etc. If it didn't, then it's not good.

And having that long waiting period is very draining for everyone, something I'm very aware of.

I'd love to know what the distinction between a "cure" and "removal or killing of cancerous cells" is. If you get all the cells, which is often not as hard as you'd think, that seems to me like a cure.

The trick is that it's not clear for years which was achieved.