No one has ever seen God. Right.Jesus the Son; the Angel of the LORD, who is the Glory of the Father.
What purpose then does the law serve? It was added because of transgressions, till the Seed should come to whom the promise was made; and it was appointed through angels by the hand of a mediator. Galatians 3:19
All these were done according to the will of God the Father, who is seated upon His throne, and unseen by humans.
No one has seen God at any time. The only begotten Son, who is in the bosom of the Father, He has declared Him. John 1:18
The God that was seen in the Old Testament was God the Son, not God the Father.
One of God the Father's titles is "Him who is seated upon the Throne".
Whenever the living creatures give glory and honor and thanks to Him who sits on the throne, who lives forever and ever, the twenty-four elders fall down before Him who sits on the throne and worship Him who lives forever... Revelation 4:9-10
JLB
So how did Moses see God in the burning bush?
God was not visible, only the BB was.
For instance, Exodus 19:18 - God appeared as fire.
In verse 20 it states, I am God, your God....
When God is seen in the OT, it is always an angel or Jesus.
Also when the Abrahamic Covenant was made, God put Abraham into a deep sleep so that he wouldn't see God as He passed through the halved carcasses.