Moving to 2170 cell/pack means moving pack production out of Fremont. It means lowering unit costs for the SX and model 3 and creates space for some other activity at Fremont.
How often can you improve margins on your entire product line, and improve performance (charging performance, as well as that track mode ability).
It is only about six months ago that Tesla still needed to ramp up the Model 3 production in order to not run out of cash.
While Straubel and other battery experts were maybe not fully involved in the Model 3 ramp, I think Tesla's window for upgrading the Model S/X production to use a 2170-based pack only opened quite recently.
And with all these other exciting things for Tesla to do, the answer for them is probably: Not very often.
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