I test rode two ebikes today, 46 & 62lbs, so 16lbs/7.25kg apart. They were both Aventons. I will say that as someone unaccustomed to cycling and definitely without the proper muscle groups, they both were very easy to pedal unassisted.
The bike I had specifically gone in to test, the 62lb bike, was just too tall and heavy. Despite it being a step through, despite having the seat at the lowest setting, I had a hard time hopping on/off at stops, but it was made extra difficult from the weight of the bike bullying me as it tipped to the side. I got to a flat stretch to test the throttle and tried to get back on the bike, but it began tipping, I nearly fell over, only catching its weight with my right leg and injuring my big toe in the process. Proper leg extensions or not, I don't see the benefit of having to headline Wrestlemania every time I have to stop.
The larger frame bike that I tried second actually weighed less than the first bike. The min seat height was almost the same, but it was much more manageable for me to mount and dismount despite my short height and joint issues. The different geometry probably helped a lot with that. At stops, I didn't feel the same sensation of being "shoved" to the side by the bike because there was just less bike pushing on me. I think I agree that lighter is the way to go.