Sorry Bill, I didn't mean to laugh at that electric bike---wait, yah I did too---LOL! Looks pretty girly---LOL!I think a lot of it has to do with just easier to get off and on..
No throwing your leg over the horse..
And Doug laughed at me before but its same reason they call "Girls" bikes today "Step Through". Even most all garden tractors too.
My new Electric bike below..
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I have one LT with a step though frame. I do call it my mobility scooter! Spray weeds and haul the weed trimmer around on it. The rest of my tractors are manly ones where a leg has to be swung over. Quite often I have to grab my leg with my left hand and pull it over the steering wheel but they are still a "man's tractor"! Sorry, I am just making lame humor! I can see where it would be so much easier to get on bikes and such that are built that way!
DAC