When designing a product, you don’t want the product to “fail”. Rather, you iterate and make mistakes in the design process and try to correct them internally so that when you release the product it’s a success.
When producing a product, you don’t want your production goals to “fail”. Rather, you need to have strenuous internal testing and validation procedures to ensure production is on time. In other words, you work out the mistakes internally so that when you launch publicly, you don’t fail.
Tesla can make all the mistakes they want internally during the development and testing processes. That’s fine and good. But when they go public with a product or even production goals, they should meet or exceed them. We shouldn’t expect nothing less.