Well, the automating of the "bandoliers" sounds like a pretty huge step. There are 4,416 cells in the Model 3 long-range pack and 2,976 cells in the shorter-ranged version. Hand-assembling all that from scratch definitely sounds like a losing proposition.
I would assume the finished bandoliers are fed into a machine to assemble the blocks that make up the battery. But even if they're being hand assembled as well, that's still only 1/20th the number of items a human has to assemble.
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