Andrew Perriman, In the Form of a God: The Pre-Existence of the Exalted Christ in Paul (Eugene, OR: Cascade Books, 2022), 36:
The sending out of the Son, as Paul has presented it, happens not in cosmic space and universal time but in Jewish space and historical time. The purpose is correspondingly restricted: it is not to redeem humanity but to redeem those under the Law, whom the Law could not save from the impending destruction that would be the wrath of God (cf. Rom 9:22). Such a narrative immediately suggests the relevance of Jesus’ parable of the sending of the Son to uncooperative Israel to do the work of a prophet-servant. But the “sending out” of the Son is probably, in Paul’s mind, most like the sending out of Moses not only to lead the people out of slavery but also, as things turned out, to negotiate the imposition of the Law in response to the transgression in the wilderness.
The Amateur Exegete 
I don’t see in Paul’s writings where he thinks Jesus was sent “to negotiate the imposition of the Law.” After all, he stresses the fact that all (circumcised and uncircumcised) have sinned and will face God’s wrath as a result of their unrighteousness.
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