I am confused how your analogy is different to the original one? the original one was also not affected by prior races.
A headstart would never be fair if gone untreated.
that's why the final results are calculated to eliminate the affect of anyone's headstart.
I think I must have misunderstood something with your comment. If you dont mind could you explain what I missed?
Ideally yes, but in the real world this would be infeasible. Things can't be tailored to one person specifically. there are so many countless factors that could lead to a headstart and it would be impossible to account for all of them.
Instead we find the ones that are the biggest factors and focus on them. Race is a big factor. But race is not the only big factor, and ideally all the biggest factors should be accounted for.