I wouldn't call these cars defective. Tesla was clearly having problems in last quater but were forced to deliver few cars for the sake of formality. These same problems might have existed in your car. Tesla used Jan- Feb to make improvements. And once again they have started deliveries again. Tesla's pattern is quite clear if we pay attention. All Sigs & beginning of production cars in this quater. People will complain about pending P90D's in April-May when Tesla will slow down again for further improvements. Signatures haven't gone to end of line, they have released all cars simultaneously IMHO. They are being delivered according to logistics.
You sound like you are stating facts like an insider with knowledge of everything going on at Tesla. I will start taking you more seriously going forward.