… , because it feels like sentiment clarification must be included and tone tags and emoji can’t cover all possible ways a reader might find to still misinterpret a statement. (or the statement carries a hidden meaning that I never realize existed, or I have made a fool of myself for accidentally quoting something someone has said in a completely unrelated situation and somehow I still think providing more context would fix that)
I tend to use it when a comma is already in use in that same sentence – or if I’m trying to be fancy.