I used to wonder why I’d see old people wobbling on their bikes after stopping at a crosswalk until I realized it’s harder to control the bike with those curved handlebars from a stop. I guess it’s more comfortable when you’re riding because you don’t have to lean forward as much but I prefer the straight handlebars still.
Wobbling would be more influenced by the caster angle than anything (which is really the rake angle on a bicycle or motorcycle). It’s the same reason cruiser motorcycles are easier to handle than sport bikes at lower speeds.
Straight bars would be more responsive since they’re a shorter lever, while the curved bars are a longer lever, meaning it takes more arm motion to turn the wheel, so those bikes should be more stable/less twitchy.
Must be more at play with the wobbly riders you’re seeing.
TLDW: Japan has step through bike frames, electric bikes, child seats, hand warmers and phone holders. If they are in any way built different or have any unique features at all, the video fails to mention it.
I’d say you can get all of those things in almost every European country, too. Saying almost only because there might be a country where you cannot find those hand warmers or whatever.
