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Battery technology in general.

And, Tesla is an outlier here. Other EVs are progressing MUCH faster.

[bdangubic]

that is a bold statement that needs to be backed by an example... while Tesla is certainly the dinosaur with the most outdated lineup of cars others aren't that much better (unless we venture into super-luxury 6-figure price zone...)

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Look at almost* any other manufacturer.

Kia and BYD are two prominent examples. They're outputting huge batteries and absolutely bonkers charging times.

But even US manufacturers have surpassed Tesla. What GM is doing is more impressive.