Graphmatica may not be suitable for creating a Christmas tree shape using traditional equations, as the required curves do not represent functions due to multiple y-values for single x-values. Users suggest plotting numerous points to approximate the shape instead. However, the program lacks functionality for drawing lines after points are plotted, limiting the ability to create a continuous curve. Each plotted point appears as a fat circle, which can visually simulate a line if enough points are used. Overall, achieving a Christmas tree design in Graphmatica is challenging but possible with creative plotting techniques.