What are two weaknesses of using a hard boiled egg to model the motion of the earths crustal plates?

Using a hard-boiled egg to model the motion of the Earth's crustal plates has limitations, primarily due to its rigid structure and uniform density, which do not accurately represent the complex, dynamic interactions of real tectonic plates. Additionally, the egg's shell cannot simulate the varying viscosities and behaviors of the Earth's mantle and lithosphere, which affect plate movement. This oversimplification can lead to misunderstandings about the complexities of geological processes.