It is unfortunately not that simple. The likes of Bosch have had a decade or two to learn how to lock up their automotive systems and they're using every trick in the book to do the same to e-bikes.
Perhaps, and then I hope they will be made obsolete as all the essential parts for making e-bikes are becoming commodities. 250W electric motors (max allowed in EU dor normal e-bikes) are not exactly rocket science. My jigsaw even has a 300W motor (though probably not rated for hours of continuous use)
