This list should only specify "what the robot has to do", not "how to do it".
This list should only be mechanisms you can realistically build given your parts and time available.
Your best solutions are going to be Simple Designs that accomplish a Hard Task.
Using Complex Designs for Hard Tasks or Simple Designs for Easy Tasks are good as well.
Try to avoid Complex Designs that do an Easy Task because those are likely taking too much time and resources.