“Losing” the tetragrammaton was one way of “Christianizing” the Old Testament”
Given the importance of “The Name” in the Hebrew Scriptures, leaving it out makes “Hallowed by thy name” rather ambiguous at best.
Correct. But all this only brings up another issue: if Christ is going to be the Lord instead of the LORD, then John 8:58 misses the point. In it Jesus is clearly hinting that he is none other than the YHWH, the LORD, which is not supported when he is referred to as just the Lord.