Zhelko Dimic
Careful bull
Firstly, it's only 15-18 pennies, if you use the scale that pennies were used forWhen you are fighting a "game of pennies" you don't just waste thousands of dollars. The volumes are now large enough to make different battery sizes worthwhile.
Secondly, there are savings if you can reconfigure car on the fly to sell where demand is, rather than nail the demand distribution just right. There is also smaller saving in having less production process variation to develop and execute.
Most importantly though, I don't understand breadth of your disagreement? Are you disagreeing only with the notion that MR and LR are the same? I am uncertain of that too, I'd give it 40% they're the same, just because Tesla likes playing long game, and software unlock offers way to recapture that money.
Or are you disagreeing that MR and SR+ are the same? That one, range difference is too small for me to believe it's different battery. That would be couple KWh diff, absolutely not worth re-engineering, writing different software configurations for charge curve, battery output power to the motor curve, QA-ing all that, dealing with extra SKUs in design, production, storing, replacement catalog etc... While price diff is $3K, cost difference to produce them if separately engineered, would be prob $500. And if battery is the same, it's a bit of a software fiddling to disable subwoofer (+1 other speaker 12 instead of 14), disable satellite view of the map, lower battery output curve, and ta-da, you have SR+ made out of MR, i.e. market segmentation at its best.
(Also please note, it's easier to lower battery curve output that you already know is safe for the battery, than it's to develop the most optimal battery curve for slightly smaller battery)