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They're pretty widely used.
Just the facts please maam. Whatever number you come up with, I bet NL or Germany has more bikes with dynamos and without USB chargers than all the bikes on the planet with USB chargers. It's a small group of a small group.
You're the one arguing about a switch for a bike, I'm merely stating that dynamo lighting is neat because you can leave it on all the time without thinking about it because there's no battery to go flat.
Yeah, because that happens a lot.
"More visible, more of the time." is still not "all of the time" if you want to be pedantic with edge cases.