The difference is "ego strength" is a real term used by real mental health professionals, and your analogy to metallurgical concepts is something you invented.

The difference is "ego strength" is a real term used by real mental health professionals, and your analogy to metallurgical concepts is something you invented. Ironic, that in a discussion about ego and narcissism you would dismiss medical terms as "muddying the waters" and try to replace them with your own beliefs to benefit your opinion.