I want you to consider the scale of the problem. In particular: cells accumulate genetic damage over time. Each cell receives a different set of mutations. S

I want you to consider the scale of the problem. In particular: cells accumulate genetic damage over time. Each cell receives a different set of mutations. So it's not just the problem of correcting an inborn genetic error across all cells, it's the problem of specific patches for every cell in the body. If you can't do this, I don't care what other advances are made, the cells (including neurons which aren't replaced) will eventually stop working.