I can see how these can be of interest to people.
For instance when my brother comes with me for a ride. I have to slow right down so he can keep up. He isn’t unhealthy, he just doesn’t cycle the same as I do, something like this would mean he can average double figures easily meaning he can keep up with me, which overall would create a better experience.
There’s no right or wrong answer. So long as people don’t abuse them by tuning them up and riding like ****, which would inevitably see them banned in the uk I see them as just another thing to keep people away from the death box at home.