I was watching a Youtuber by the name of “Boutique Blu-Rays with Elliot Coen” and he made a note on how difficult it would be to do an upscale of the films, particularly RotK with the CGI animals and have it not look fake.
I guess there’s only so much upscale you can do without messing with the picture, I don’t know if that is a factor for Dr.Dre but it makes me wonder.