I've yet to get any information on one thing though, are safety drivers operating under the assumption that the car works at SAE2 or at SAE3? Because if it's the latter, the driver has no cause to keep looking at their phone. If it's the former, the car should have a deadman's switch to ensure the driver stay alert.

An other thing that is not clear is whether they were looking at their phone or at instrumentation (e.g. telemetry or the like).