A geographer would choose the Robinson projection for a reference map in a textbook primarily because:
The Robinson projection creates a map with minimal size and shape distortion, making it easier to read.
This projection is designed to balance the distortions of area, shape, distance, and direction, providing a more visually appealing and practical representation of the world. While it does not maintain perfect accuracy in any specific aspect, its balanced design makes it suitable for general reference purposes. It does not create completely accurate shapes or equal-area representations, and it is not primarily focused on maintaining accurate directions.