This seems to assume that the current bicycle design is obvious and inevitable, but that is not true. The bicycle went through a lot of different designs before

This seems to assume that the current bicycle design is obvious and inevitable, but that is not true. The bicycle went through a lot of different designs before we got the "safety bicycle" in the 1880s. Here is a small video showing some previous designs https://www.youtube.com/watch?v=WI6lgUlEUFU https://www.youtube.com/watch?v=WI6lgUlEUFU