Depends on the engineering requirements of each system. Maybe? Price point, materials, durability, manufacturing volume, size and other factors definitely affect the weight.
It seems quite shortsighted, weight makes a huge difference. My brother recently bought some 75-80lb steel-framed e-bike with small diamerer wide wheels, and couldn't even make it 30 miles with pedal-assist before it died. The last 10 miles his speed plummeted from 15-17mph to 4-6mph at most, and this is for a very strong (but out of bicycling shape) guy. On unpowered bikes he is much faster than me, and I'm not a slouch.
I tried riding the steel thing with no battery and it was not pleasant at all. Compare that to my LunaCycle, even at 50lbs total it's not that bad to ride with no power.
Is it mostly clueless people (like my bro) falling for "It has a battery so heavy bike weight will not matter"?
