Not sure how I feel about the total ban of scooters. I don't live in Nashville and I've only been in the area (Hendersonville) for a little over a year but I see what he's talking about regarding how dangerous they are. Also with them being left everywhere kinda looks bad and causes trip hazards for people trying to get around the city on foot. A bike/scooter lane would help and I think it should be more of a point a to point b type thing as opposed to using it and dropping it off where ever they feel like.
I didn't notice it much until recently. Several times driving through the city I got stuck behind a scooter driving extremely slow with no way to get around. I don't work in Nashville either currently so anytime I'm there it's to walk around or eat but it's still quite annoying to be trapped behind them. On the flip side, they do serve a purpose if utilized and maintained correctly. It's just that if you replace a car with a slow scooter, you get worse traffic, not better.