For some reason "Apple engineer" is used a lot (see title) in discussions around this on both ends (i.e. "he was an engineer and thus knew his stuff/was credible, and he voiced some concerns to friends/family, so let's agree with it being Tesla's fault" vs. "he was an engineer and should have known/anticipated the system's caveats"). The thing is you cannot have it both ways, so I think (and I think we agree) we should not appeal to the driver being an engineer at all.