If your point is "Autopilot only works on perfect roads" then they might have well pull the plug right now.
Dirt, snow, rain, fog, dark, and other common conditions could obscure even correctly painted lines, and it just isn't realistic to expect perfect roads throughout such a large network anyway (in particular as human drivers can infer the line is meant to be there from the neighboring lines).
At its core, a system like Autopilot is meant to stand in for humans. Plus in this video where they reproduced the accident there was a full chevron pattern so the argument is flawed/wrong anyway: https://www.youtube.com/watch?v=6QCF8tVqM3I
Dirt, snow, rain, fog, dark, and other common conditions could obscure even correctly painted lines, and it just isn't realistic to expect perfect roads throughout such a large network anyway (in particular as human drivers can infer the line is meant to be there from the neighboring lines).
At its core, a system like Autopilot is meant to stand in for humans. Plus in this video where they reproduced the accident there was a full chevron pattern so the argument is flawed/wrong anyway: https://www.youtube.com/watch?v=6QCF8tVqM3I