>This is an explanation for why they designed their own seats, and basically amounts to "existing seats were uncomfortable." That makes sense when the status quo is junk, but now they've got a good seat, what does it matter who manufactures it?

>Are they expecting to do a lot of further seat innovating in the future? Does seat technology have a rapid rate of change?

Well maybe for other manufacturers that rely on these suppliers no but I think the real point that Elon and Sandy were getting at was that anything a user touches should be made in house as that is what you can craft carefully to perfect the customer experience. Will their seats change? Well so far they have gone though 4 or 5 revisions so it seems like they continue to make changes and iterate.

>People care more about what you're doing right now than what you did when you were just starting out. Tomorrow's reputation is based more on today than it is on yesterday.

Suppliers will happily give a quote, its just that the quote will likely be higher to account for the added expense of working with Tesla. People go from supplier to supplier and since this field is very much relationship based, I can see Tesla losing out to other manufacturers especially when supply is crunched like right now. For a lot of parts(for example seats) there are only 2-3 companies to choose from. If they burned bridges with all three then what?