If the thing you care about is clear sidewalks, scooters are such a tiny problem that they're barely worth mentioning. I've had to step over parked scooters a handful of times. Every time, they were in an alley that no wheelchair or blind person could have navigated. The sidewalk was also populated with garbage cans, bicycle parts, and some random trash.
If a scooter is poorly parked in a high traffic area, people tend to move it out of the way. If it's in a low traffic area, then there's almost always other stuff in the way as well.