In thinking, politics, physical appearance and every other element of life, we are naturally attracted to that which is simple.
Complication demands effort. Keeping something simple gives the audience an easy access to that thing.
If Meaning is made in the mind, then simplicity does not necessarily obfuscate understanding. If anything, it has the potential to help the audience better understand the issue because it will encourage them to imagine something to fill in the gaps.
Those who notice those gaps will understand that they are there due to the simplicity of the object or action, not because there is some fault with the object or action.
In this way, simplicity encourages communication and cooperation.