I think they failed to finish developing a more complex second row, and what is being delivered is the compromise. There are not many other good explanations on why making some straightforward seating would be so troublesome.
I suppose there's nothing straightforward about engineering a seat that is on single post, vented, tilts and slides while supporting seat-belt restrains that do not collapse during side or rear collisions.
I find it interesting that while Tesla is blaming seat supplier for ongoing delays they claim that seats are made in-house now.
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