That is a great way to operate a motorcycle. I owned bikes up to 1100cc when I rode and I did ride assertively. But I could keep my place in the flow of traffic. I had the power and manuverability to avoid situations. I maintained my "presence" on the road with an assertive stance and positioning. If I rode my ebike like that I would be dead, plain and simple. I do not know how you can equate operating a motorbike with riding an ebike.Assertive does not mean bossy, cocky or arrogant. What it means is riding where you can be SEEN all the time and making that your responsibility not the responsibility of the other road users. We, as cyclists, have a place and a right on the road and we share the road with all the other drivers/riders. We are no different to the other road users. If you take it on yourself to be responsible for others SEEING you, your outlook, whilst on the road, will be different.
Been training PTW riders for while now and it honestly works
What you describe above, to me, equates to defensive driving habits. Having high viz, lights, mirror etc and being aware is being defensive. Perhaps you could put together an assertive bicycle riding course and let us have a look at it.
Cheers