Your grandpa is one person. Retesting 100 million drivers to find the bottom 10% is not exactly very feasible. For a model of FSD, all vehicles on the road share the exact same level of performance. We are talking about scale here.

It is like comparing me selling some vegetables from my garden to a neighbor and a company selling 100 million units of vegetables across a country. It makes zero sense to say "they should both have the same level of safety standards", since a listeria outbreak sickening thousands is far worse than a tainted cucumber poisoning one neighbor.

Tens of thousands of cars using dangerously poor driving level software is worse than any one individual driver that may have dangerously poor skills.