Outside NL, the "step" is a scooter, and the "scooter" is a moped.
Mopeds should be banned from bike paths, or there should be heavy enforcement of speed limits on paths.
A little folding 2 wheel platform vehicle going 16kph is certainly no worse than a large Dutchman riding the same speed on a 35kg omafiets... not to mention the person on a 40kg electric bike who is doing 23kph.