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IIRC the Tesla Roadster had a 2-speed transmission initially, due to engineering challenges with high-rpm bearings. But they struggled with the engineering challenges of high-torque transmissions, and eventually sorted out the bearing issues and went back to 1-speed.

Most EVs have a single-speed gearbox. A few have multiple gear ratios, but it's not common.

(It's not unusually for ICE vehicles converted to EV to retain a manual transmission, but conversions aren't being done in large numbers.)

For conversions you usually find an optimal reduction ratio for your motor and whilst you can reuse the transmission it’s fairly rare that you continue to operate it.

They have gearboxes with a fixed ratio that is optimal for the vehicle, some have variable speed gear boxes 2-3.

The motor isn’t just connected to the drive train in 1:1 that won’t end up well for neither the drive train or the motor.

Porsche Taycan has a 2 speed transmission: https://www.caranddriver.com/news/a28903274/porsche-taycan-t...