Conservation, symmetry and simplicity were the guidelines for most of my (professional) life. Maybe that is the reason why most of the (everyday) problems appear too complex to me?

Science may be described as the art of systematic oversimplification.

Karl R. Popper: The logic of scientific discovery, Hutchinson, 1959.

The aim of science is to seek the simplest explanation of complex facts. We are apt to fall into the error of thinking that the facts are simple because simplicity is the goal of our quest. The guiding motto in the life of every natural philosopher should be "Seek simplicity and distrust it".

Alfred North Whitehead: Concepts of nature, Cambridge University Press, 1920.

...and Einstein said it as simply as possible: "Everything should be as simple as possible but not simpler".