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Because a Nissan Leaf, Cybertruck, Model F, City Bus and Formula E cars all have identical powerbands.
Electric engines come in a huge amount of varieties.
I mean generally, ya, most of the time it comes down to gearing and how well the motor is made. The reason teslas generally feel really quick is because they can afford to have a lower gear ratio due to their motors having much more rpm to play with, the leaf motor probably isn't the best out there, so it likely needs a higher gear ratio to compensate for how little it can rev.
Really, they could just generalize the minor details of the motors and just add the general designs, like brushless permenant magnet motors and ac traction motors. They all generally have three phases, they all generally lose torque in the same ways, and the powerbands are usually really smooth and linear. The hardest part would likely be figuring out how gearing would work and what gearbox types would be used. But other than that, just make some generic motor/inverter combos and a couple chassis types, then that would be the groundwork laid for evs in automation.
They've been around a lot longer than that. In the early 1900s electric cars were seen as a better choice for some in rural areas before we had the infrastructure in place for gas stations. In the 1920s when women generally started driving, electric cars were advertised as a choice for women because they were quiet and you didn't get filthy when operating one. The price difference however was a handicap then as it is today. On average an electric car back then cost about $2500, while you could get a Model T for $800.