They don't use gyroscopes so I'm not sure I'd say they superseded segweys technologically.
I also would hesitate to say they solve a common problem because the current market glut seems to be trailing a recent hype bubble of electric scooter startups.
Humans already have two "gyroscopes" in our ears, which for most people work well. It's really no surprise that bicycles are more popular than segways.
I also would hesitate to say they solve a common problem because the current market glut seems to be trailing a recent hype bubble of electric scooter startups.