My therapists never did this but I do talk about the different definitions and experiences of emotions with friends and colleagues and I find it both interesting and useful. I am not always aware of what I am feeling in the moment though so I do find it helpful to become aware of my own feelings and know where they come from, because they influence my decisions and acts whether I am aware or not. Don't think someone else can do that for me accurately but just defining, I see it similarly to using a dictionary when I am unsure about the generally perceived meaning of a word. Then I can try to use the word more appropriately in the future. Like learning a language I am interested in learning and using, either fluently or just on basic levels, a few words etc. I have an interest in trying to use language and descriptions accurately so for me it is interesting even if I fail at it.

I don't think it is useful if someone is not interested and if a T tried to impose it, it is indeed outside of the scope and no point.