I just realized that OneWheel has lowered the max speed of at least some boards.

When I first got my Pint, it maxed out at 19MPH (which is ludicrous), but today it lists 16MPH (which is still really fast) as the max speed for all modes.

I haven't actually been past 16MPH, so I can't say whether they're now limiting it or if it was just never able to go 19MPH in the first place.