Wouldn’t it have been easier and better to take the already edited cinema version, which I think looks really good, and create an extended edition from it by inserting the missing scenes, etc.?
The 4k-dremastered theatrical edition looks good. But there are still many issues, like DNR, lack of detail and softness. Only so much DrDre can do with suboptimal source material. The extended cut looks sharper and more detailed. The only issue: the color grading.
Since the color grading of the theatrical cut and extended cut are massively different (colors and contrast) it would be painful work to insert the extended scenes and match them with the theatrical cut so that you don’t see the change. Plus I bet you can still see the changes in detail and sharpness.