Me personally I think there needs to be some restrictions. If there are no restrictions at all, people will start behaving like crazy. Which will be detrimental to everyone. 28 miles per hour is not a bad speed but it is a very high speed for many people, especially among senior citizens who are not completely healthy but they need to exercise. You will notice that some stupid people ride e-bikes at high speeds in family parks which can lead to accidents, Even sometimes it happens. Think about these, what those people can do if there are no restrictions. Me personally I think there needs to be some restrictions.