I think SOME bikes are not set up for high speed limits the US has, or geared low for other reasons.
There is quite a range, the Harley's and Buels I have had were geared very tall in 1st gear, bikes like the TW 200 were geared very low (in my book) for dirt or street. My TU250 is geared like a trials bike, 1st gear is stupid low, low enough to be useless.
Even if Suzuki thought the bike was only good for learning on, or city use, the stock gearing is way too low.
The new Bonneville seemed spot on, most dual sports seem about right for dual sport use, the old Triumphs (750) seemd spot on.