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It may not be the best design, but it is clearly stated in the product literature (user manual and warranty info) multiple times. If you read the comments its quite similar to changing your oil. If you don't change it, your engine will blow up eventually. If you don't plug in, your pack will die eventually.
Honestly, I'm sure Tesla engineers have thought of this scenario and have reasons why they did things this way. The car is not only beautiful but quite the feat of engineering. I'm sure they didn't have ignorant engineers.
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