Human vision goes years before our cancer rates spike. We are essentially living past our primitive life expectancy until something fails which is very recent and evolution has had little time to catch up to this.

At a nuts and bolts level cell volume is less indicative of cancer as interfaces like skin, lungs, and intestines are vastly more likely to get cancer than most other tissues. Early cancers are often the result of mutations during growth from a single cell which is closer to log(volume) vs simple volume in terms of risks.