I’ve not seen Radical Acceptance used in this sense before. My familiarity with the term comes from working on chronic pain and fatigue issues. My mental health has improved by beginning to cultivate a deep acceptance of my physical limitations — which I *cannot* do anything about. Stretching this into a situation where I have a choice (apart from accepting or stressing and crying over things I am simply unable to do or achieve) rather takes the edge off it’s effectiveness to me.