They were meant for DVD. Why Lucas thought they were good enough for Blu-Ray, I really have no explanation. Not to mention further changes. And fixes.
Just to think even the 2020 UHD only happened because of the 3D release that was cancelled and those scans.
We had the same HD master on DVD, HDTV, and Blu-Ray for what 15 or 16 years.
John Lowry literally said that when the Blu-Rays would come out, Lucas would most likely come back for a better restoration… That never happened.