Why? By your logic, this high priced but less functional car should compete terribly unfavorably with the segment listed, yet it is competing well. Seems to me you are incredibly impressed if you’re asking for that comparison.The problem with this theory is that the Model 3 is only PRICED like an entry level luxury car, but it is actually more properly categorized functionally as midsize sedan, like a Honda Accord. Make that sales comparison.
Imagine a chocolate bar that’s similar in composition to a Hershey bar but sells at the price of a Green and Blacks. Would you compare it’s sales numbers to Hershey or to the higher tier market? If the former, I recommend education on the topic.