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Regenerative braking is a major saving in energy cost, and it's something that requires a battery component to store the recovered joules, and electric motors to put those joules to use. If you need a battery and electric motor anyway, the simplest solution is pure electric.

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You could also store the regenerated energy in a flywheel. That would be even simpler and cheaper than electric.

Flywheels are not silent and have unwanted gyroscopic effects. Getting even more impractical, you could store energy in a spring like a wind-up toy.

A pure electric system is much simpler as the motors are the regenerators and there is one energy store.

You're not going to want a flywheel in a car that's going to make any turns

Mount it horizontally?

Hills tho

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