I think that there could be different speed limits for e-bikes as there are for cars. In fact in the Spanish Basque Country there is exactly that - cycle paths are limited in many sections to 10 km/h, 5 where there are pedestrians. In Irun bicycles and cars are limited to 30 km/h on the street and so on. This is a bit strange because:
1. most bicycles don't have speedos
2. bicycles don't have number plates so can't be fined by speed cameras...
If you are pedaling, drivers (the ones not looking at their phones...) perceive you as a cyclist and can not judge your speed correctly. I have experimented with your suggested speed of 35 km/h and cars will almost always pull away from stop signs cutting you off.
Solution: daytime running lights help a lot, they see you more as a moped and 9 time out of 10 stay put. I always ride Number Two with the lights on, they are hard wired to the battery.
I have said in other similar threads there is only one solution to the problem: infrastructure. And as usual the Dutch are leading the way with inter city bike super highways destined for speed pedelecs - 28 mi/h.
For the moment I am happy with the current speed limit because you are only limited to that speed when assisted, beyond assistance you are only limited by the legal speed limit of the section of road you are on. Very easy for me to attain downhill on my current non motorised steed...