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Re:Mercedes Readies First Tesla Rival in $12B Attack by btilly on Wednesday September 05, 2018 @12:23AM (#17915020)
My immediate guess is because other car companies outsource the production of most of the parts, and the companies who make those parts are happy to make more to sell on the aftermarket.

Tesla manufactures parts itself, and is still getting their main production lines working right.

Re:Mercedes Readies First Tesla Rival in $12B Attack by lazyjones on Wednesday September 05, 2018 @03:17AM (#17915708)
Tesla has plenty of parts built by other car makers / suppliers.

https://www.carscoops.com/2018/05/tesla-blames-bosch-recall-...

Re:Mercedes Readies First Tesla Rival in $12B Attack by btilly on Wednesday September 05, 2018 @07:19PM (#17922672)
Tesla does. But builds most of their parts in house. And even outsourced parts may wind up inside of the part you need to replace, and therefore you're still bottlenecked on Tesla.