Taqrīr ḥāl al-mushabbah strengthens a condition or claim already expressed, especially by giving an abstract or moral judgment a vivid, familiar image.
The comparison helps the audience retain and feel the force of the statement; it makes a relatively abstract claim more firmly established in the mind.
This differs from an initial description. Bayān al-ḥāl chiefly reveals what a condition is; taqrīr reinforces the judgment about that condition.