Claim. Because the Fall severed direct parent-child access, God could not relate to fallen humanity in His own person in the OT Age; He instead commissioned angels to act on His behalf as temporary mediators.
Elaboration. “Originally, in the Old Testament Age, God was supposed to work directly with people … but the providence could not be completed because of the Fall. Therefore, in sorrow, God pioneered an alternative way of relating to people through angels” (1.2. In the Old Testament Age, angels worked on behalf of God, 1-283, 1956.12.16). Since angels are also divine beings, they appeared to people as God and served as stand-ins “until the coming of Jesus.” God could not appear as a father to a servant — the relational level did not yet permit it. Angelic mediation was therefore not God’s preference but a grief-driven workaround within providential law.
See also. csg-jehovah-was-an-angel-not-god, csg-restoration-ascent-servant-to-parents