People also tend to very much forget that cancer is not a disease, but a class of diseases. Not all cancers will respond equally to the same treatments.
I'm not talking about across different people; I'm talking about different types of cancer.
The causes and treatments for lymphatic cancers are different from lung cancers are different from breast cancers are different from prostate cancers are different from brain cancers are different from liver cancers, ad infinitum.
That is clearly something that can be targeted in principle (and not the only thing). Whether the "causes" are different is irrelevant. Whether the treatments are different is a choice made by people, and also irrelevant.
Well there must be some things they all have in common. Anaerobic environment I thought, is that still the case? No transport of oxygen via iron possible, in my layman's memory?
Like saying suffocating in vacuum and suffocating from oxygen substitution in an enclosed space (like by inert gasses) is equal. The causes are different enough that different solutions are necessary.
It looks just like the "string theory landscape", next you will be told that we need to stop worrying about comparing predictions to evidence when it comes to cancer research. Just wait a few years/decades.