[three_seagrass]

They don't use gyroscopes so I'm not sure I'd say they superseded segweys technologically.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.

[catalogia]

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.