A threat can be violence but it’s not necessarily so. A threat is an expression of a negative result if something is not done. The negative could be violence, monetary loss, embarrassment, end of a relationship, or any other negative.

Definitely not delving into legal definitions of coercion because I am not a lawyer and it is not relevant here.

> and it’s very common for the usage to cause conflict, the exchange of “are you threatening me?” “no, i’m just telling you what I’ll do” is very common.

I think you mean that threats are a common cause of conflict. “Are you threatening me?” “No, I’m merely posing a negative outcome that I will inflict if you don’t do what I want. Totally not a threat. Definitely not.”