Interesting question. So, clearly I don't have any experience with the "good relationship" termination stuff!

But, I am wondering -- one of your scenarios involves switching to another therapist (for whatever reason). Unless you're looking for something very specific (E.g., somatic, EMDR stuff etc) with the new therapist, I don't know how / why the current T would consider it parting on good terms?

As in, this may be just my experience but it seems logical -- current T took umbrage at my leaving her (psychodynamic) for a psychoanalyst. So, short of telling her how she sucked (see good relationship go out the window) or straight up lying, there was no way out of it.

That question aside though, closure for me would mean (in a super idealistic sense), a shared, warm understanding of the major stuff that's happened in therapy. Some reminiscing etc. Mostly in good (bittersweet yes) spirits. Warm glow and all that.

(In case it isn't obvious, I've actually rarely ever had it!)