would be in the summer, not in the winter.

Full studs (300/tire) are super slow for me on my bike (the W160 isn't too bad). My ebike speed doesn't change much at all with studs. I custom built my ebikes they are light, stealthy and fast (40km/hr). In the winter on the e-mountain bike I typically do 30km/hr (wind chill becomes a factor when it is too cold, LOL).

although I can pedal at ~30kph on a road bike in the summer, my studded winter beater probably does about 20kph for me in the winter.. So yeah, a moderate ebike is about as fast as a road bike in the summer, and much faster than a bike with 600 studs in the winter.