So I think I have figured out the process Tesla follows on the expected delivery.
it’s like making pizza - you have several pizzas going (aka car reservation batches) and so you look for flour (body), water (battery and motors) and yeast (interior) for them. At that stage, your delivery is some arbitrary future date that you know is wrong because you haven’t proofed the dough as yet.
now when the dough is made fresh (aka procurement initiated for all the materials), your delivery goes blank, because you don’t know which dough ball will be made first - yes you have the dough balls, but which unlucky bastard will be made last - you don’t know that!
now when all the dough balls are proofed (materials in stock at the factory), you lay them out in a line and depending on if you’re a right handed person or a left handed person, you know which way you’ll go - dough ball #1, vs dough ball #last. That is when you assign a potential delivery window to the pizza - aka car
now the shift changes and the other dude coming to make the pizzas is left handed (assume you were right handed)! All of a sudden, doughball #last becomes doughball#1. There is now a glitch in the matrix and everything goes blank again for a bit until the new delivery time gets established for the left handed pizza dude!
then the shift changes again - process repeats! Eventually all the dough balls become pizzas, but we still haven’t addressed the toppings (aka wheels) !!!
see this is where it gets really interesting! Right handed pizza dude will shape some dough balls but put them aside in the parking lot because he ran outta pepperoni! Left handed pizza dude will (depending on if he’s a hard worker) either take right handed pizza dude’s shaped pies and put his own toppings on them or shape new dough balls!
irrespective of shift change, at some point there’s very few dough balls left and then the date range gets tighter! This is also why some lucky bastard gets his pizza within 10 minutes of ordering vs other unlucky bastards who have been in the middle of the batch and wait forever!
and that is how this car is made! Case solved!