I’m sure ECT is being misused occasionally, but what I’m referring to is the underlying condition such treatments are addressing as well as the research associated with finding what treatments are useful in which situations.
Seasonal affective disorder and bereavement-related depression may have similar symptoms on the surface, but there’s different treatments due to differences in underlying causes.
Some conditions may be a continuum with the same underlying cause taken to different extremes, but that continuum need not be continuous down to normal human behavior.
Addendum: I believe I’m close to figuring out what you are communicating but for me it’s not working.
I’m reasonably sure we’d agree that neurological conditions are complex and that labels only tell part of the story.