If we were talking about ensuring the driver is wearing a seatbelt, then I would agree with your point as that has no direct impact on the performance of Autopi

If we were talking about ensuring the driver is wearing a seatbelt, then I would agree with your point as that has no direct impact on the performance of Autopilot. However, Autopilot requires a 'fully attentive driver' to function as intended. Improving the safety features of a component required for it to function does improve the safety of Autopilot. Autopilot is a suite of driver assistance features. The driver assistance features can't assist the driver if there is no driver because they've moved to the backseat.