Why isn't the fit of the continent perfect if they were all attached 200 million years ago?

The fit of continents is not perfect due to several factors, including erosion, sedimentation, and geological processes that have reshaped the Earth's surface over millions of years. Tectonic activity, such as plate movements, has also caused continents to drift, break apart, and reshape their edges. Additionally, changes in sea levels and the accumulation of sediments can alter the original coastline configurations. These processes contribute to the irregularities observed in the current continental margins.