I think the availability bias is only pertinent for a short period of time, quite possibly ship by ship.
A particular model/option that appears to be more accessible now, may well be quite different to when the next boat load is allocated, or the next etc etc,
One would like to think that as more cars are produced, the model/options more closely match actual orders rather than what Tesla deem to be required. Certain changes to orders will only perpetuate the mismatch between actuals vs deemed imho.