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I think it's easy, especially for Americans, to overlook that the Honda Super Cub is the most produced motorized vehicle. It, or variants of it, are the ubiquitous motorcycle/motorbike in much of the world and range from 50cc to 125cc due to licensing and insurance tiers in various countries. I own a few mini motos and love them. These are the ones I currently have tagged:
2021 Honda Trail 125
1980 Honda C70 Passport
1966 Honda CM91 Rally (Two of them, one black one red)
1984 Honda Trail 110
1963 Yamaha Omaha Trail MJ2T (55cc 2-stroke)
Lots of the small bikes on the market are retro styled (or authentically older since they've hardly changed in over a decade like the TW200, XR150L, VanVan 200) which I think has great appeal. Small bikes being approachable is definitely a big driver for their popularity. I keep panniers on my larger bikes but have a rear rack for cargo on the small bikes, so the small bikes are better for lane filtering. When there's a quick errand I avoid the bigger heavier bikes simply because of the little bit more effort they require to roll backward out of the garage. The everyday convenience is there, and you can also choose to greatly inconvenience yourself by riding slow back roads to avoid highways to get a slow and engaging touring experience that's often skipped on bigger, faster, and more capable machines.
I also have an e-bike and use it a lot around town and on trails. I typically ride it without pedal assist but then turn the pedal assist on for steep mountain inclines where on a conventional bike I'd dismount the bike and walk it up or just give up and turn around.