This complete failure has led the Tesla engineers to develop a high RPM electric motor, which doesn't need multiple gears, digital motor controllers, digital chargers ...etc... just a fixed gear ratio transmission.
In 2012 Tesla designed their next, more affordable, electric car, the Tesla Model S. It was a complete redesign of the previous "EV conversion-like" Roadster, so it became significantly more practical ... and somewhat cheaper. In 2016 they made an SUV on the same platform.
This 2012 design was kept right up to the 2017 launch of the Model 3, which had a more advanced, more efficient motor and a more advanced battery pack.
They manufactured a couple hundred thousand Model 3s, it seems to be going well, but now it is time to improve the Model S and X, which still use the old induction motor design with 2012 electronics... just a bigger (100kWh) battery pack.
What they decided to do is to leave the car's architecture alone, and focus just on the old motor+controller technology. Long story short, they replaced the front motor with a permanent magnet motor and silicon carbide controller - technologies originally developed for the Model 3. They also improved the wheel bearings, lubrication and switched to low roll-resistance wheels, so in the end they achieved a >5% increase in efficiency, from the old 92% to 97%.
Officially the new Model S and X with the new front motors and largest battery pack can go 370 and 325 miles on one charge, instead of 335 and 295 miles, BUT in good conditions the Model S can go more than 400 miles and the X more than 360 miles, as MotorTrend recently found out after their real world test.