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A higher speed electric motor makes a lot of sense:

• Lower current - electrical losses are (I882)*R so a faster turning motor will have a higher, back EMF needed a higher voltage. Higher voltages reduce resistance losses leaving more power to the motor.
• Higher feed voltage reduces current loss in the battery and power lines.

The upper voltage limit is set by the switching power electronics. But this constantly improves as we make better switching devices.

Bob Wilson

EVs, Hybrids Set to Exceed 50% of China Car Sales for First Time - Bloomberg

this news is revealing in that our media has tried to pour tons of clickbait drama into plug-in sales news that occasionally shows sales dip (implying the end us near for plugins) down on their upward spiral.
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A Tesla Semi was apparently returning to the Tesla giga factory in Nevada for a fresh load of cargo when the vehicle ran off the road. These electric only Semi-trucks are frequently used to ferry batteries to the Fremont factory. In this case there was no trailer on attached to the tractor.

Cal Trans spent most of the day cooling the battery pack below ignition temperatures before trying to tow it away. Elon iMusk is fond of pointing out that normal ICE sedans have fires too. I don't recall too many of them needing a day to cool down enough to transport the carcass away from the scene.

More information here: A Tesla Semi crashed and caught fire on a California highway - The Verge