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Because certain parts should not be exposed to the outside until assembled or they need to be cleaned again. You want clean welding joints and seems where you glue things together. Certain glues or compounds don't work well in certain temperatures/humidities, you want a controlled environment.

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I'm sure that the guys there are not that stupid. You can weld "in the open". Just have to make sure that there are not big air flows

>are not that stupid

Then why are they producing cars in a tent in then first place? NUMMI was building 6000 cars a week at its peak,and Teslas are supposed to be simpler and the manufacturing process more advanced.

I don't know what their precise constraints are, but they are already building 2500 S/X per week there, add the 5000 Model 3 and you are already at 7500 cars per week. Tesla also produces more parts in house than other car manufacturers, that might contribute to the space constraints.

They are only doing parts of the assembly there. Processes that require a cleanroom e.g. paintjobs are done inside the factory.

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