My big issues with motorized bicycles are lanes to ride and rules of the road. I see people riding them on sidewalks, in streets, and in bike lanes. It is almost like people on motorcycles who ride in the break down lane or lane split (both of which are illegal in Texas).
We already had/have a HUGE problem with the escooters, people getting run down by kids on the sidewalks and riding them in traffic downtown.
I am for this 100%, but please put down infrastructure and some sort of rules of the road and enforce it.