Interesting. I believe the person who coined and replicated the “step out of your comfort zone” just needed better parenting. My mother’s version was “Get off you duff and do something”. Seeking comfort and stepping away from it are dependents. Like dissonance and resolution in music, all activity requires “a lack of safety and comfort in the short term” which makes the return to comfort gratifying. Balancing the the two makes life rich and rewarding and the inability to do so is “problematical”.