I realized that when riding on my ICE bike, I use the sound or the vibration of the engine to figure out what gear I'm in. I could also use the rev counter, but that would involve taking my eyes off the road. If I was really smart, I would remember what gear I'm in, but sadly, I'm not.
An electric bike will have very little sound and practically no vibration. That means that I would have to look down to see where I am, or get better at remembering gears.
Of course, it may not matter all that much. If I crank the throttle up and I get sluggish acceleration, I could pop a gear or two down and try again. It's not like I'm going to stall the engine or anything.
Also, looking at the video of the Empulse on the dyno, the motor does indeed make noise when spinning fast, so I believe that I would be able to tell if I was already near the top end without looking. People with
actual e-moto experience would be able to tell if that is true or not. I'm just guessing.