When, typically, a man explains something, often, to a women, that the man should already be aware the women knows, It is often called mansplaining. aware of the negative connotation why do I do it?
Demonstrating competence
Describing something I am aware the other party already know. - I can demonstrate that I am competent, That I know what I am talking about.
Asking For Help
explaining something I am struggling to understand. - I can hope to be corrected. To have what I misunderstood explained further.
Bounding
Demonstrating a shared interest as a quick way to bound over something we have in common.
Weaponised incompetence
To avoid having my word count for the safety of limb or property.
Shifting the Overton window
Shifting the Overton window by redefining the terms of our society, to make progress easier.