What is the main purpose of selecting the correct setting on the blender for shakes?

Selecting the correct setting on the blender for shakes is primarily aimed at achieving the right consistency. Different blender settings are optimized for various types of textures and thicknesses. When making shakes, it's essential to blend the ingredients to a smooth, creamy texture that is enjoyable to drink. The appropriate setting will help incorporate all the ingredients thoroughly, ensuring that items like ice cream, milk, and any additional flavors are well combined without being over-processed or under-blended.

The other options, while they may contribute to the overall blending process, do not address the primary goal of achieving the perfect shake consistency. For example, measuring ingredients accurately is important but does not relate directly to the blender's settings; similarly, blending faster does not necessarily equate to achieving the desired texture, and avoiding spills is more about the blender's design and how ingredients are added than the blending settings themselves.