Since it's late, I'll share a rumor, but take it with a grain of salt.
Whispers on Reddit that the Model Y SR AWD will be priced at $59,990, or $3,000 below the LR AWD.
It was corroborated by a reputable user, as well as other rumors heard by a mod.
That will insure no one buys it and goes to LR or the savings on the pack is so great the margin is much better for Tesla VS say a non-4680 LR.
Tesla Economist has a theory that the EPA numbers on this car are wrong. The weights are weird and the efficiency is weird.
If the range was a bit higher, it would all make a lot more sense.
Another possibility is they are being super conservative with the range and using software limiting for a while until the packs prove out.
PS: Someone else posted a link to this yesterday or a day before, but worth revisiting perhaps.