Unless I missed something, this is a completely unsupported claim by the article. Passion projects and retrofits are nothing at all like manufacturing.

While there is nothing wrong with converting your classic car to electric, if the powertrain is shot (they are harder to maintain as they age), but IMO, it looses the charm of the point of having a classical car.

Few years ago, there was a trend to do these conversions, but that stopped as people realised the car loses its charm and the feel of having old classic car, and most of them are not being used as dailies anyways.