> that’s ignoring the clear cut examples where it’s not going to be considered

The 2nd sentence outlined when it would be considered and implicitly when it would not.

You seem to believe some cases of depression warrant ECT. Some do not. It's subjective at the margins. But don't call it a spectrum!

No that’s not what I just said.

Spectrums extend continuously from normal to disorders. So if you believe depression is a spectrum you must also believe that no treatment is necessary for some people with depression. However if depression is a disorder there may be some cases that are on the margins that aren’t quite depression that still warrant some forms of treatment.

Your definition of spectrum is not standard. And the disorder called depression commonly is called major depressive disorder clinically.

I could list a bunch of sources supporting what I just said but I’ll just say.

https://www.ifeet.org/files/DSM-5-TR.pdf

DSM V has depression as depressive disorders, but lists “Schizophrenia Spectrum” and “Autism Spectrum” so I invite you to consider what distinction for spectrum is being used.