Thank you, i have never had anything to do with gearing (or engine swaps, etc) and i'm trying to get my head round itThe highest gears in a transmission are used to allow relaxed and efficient low engine speed at high road speed, not for top speed. Most cars with more than four gear ratios (in a manual) hit their highest speed in something lower than the highest gear. Continued high speed within the normal operating range are not a concern with an electric motor, so I don't see an issue with losing the upper gears.
With an OEM EV motor such as the one from a Leaf, if you used the stock transmission you would never get past second gear, because the motor should be run so much faster than the original engine. With a motor like this, omitting the transmission is an issue with losing the lower gears, not the upper gears.