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Originally Posted by RedDevil
The battery layout is optimized for performance, weight, cooling and crash safety. It is hard to combine those qualities with a modular, expandable design.
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But then you wind up with expensive, incompatible batteries, which will probably wind up being unavailable or prohibitively expensive in a decade.
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If anything, the biggest fault Tesla made was to rely on outside suppliers.
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No, their biggest mistake was to invest a lot of their capital in developing autonomous driving. How much does that bump up the unit cost of a Tesla? And what percentage of buyers actually want it? Then there's replacing usable tactile controls with a touch screen.