After reading the two reviews of GITS IMAX previews (here and here), the items mentioned in the title became clear.

Why not just create a female RoboCop starring ScarJo and the same ethnically random ("diverse") cast in some imaginary future city?

This could have been a decent cyberpunk film without needing to "prettify" the gritty GITS anime aesthetic with neon and giant holograms everywhere, or blatantly whitewash a Japanese anime (Motoko is now "Mira", last name unknown?)... or, as the reviews also suggest, dumb down and replace the real GITS concept with a blockbuster-friendly Hollywood plot.

They could have gone the way of the Matrix and:
- lifted eighty percent of the plot from GITS itself;
- sprinkled in "deep" transhumanist philosophical moral dilemmas;
- blended the other twenty percent with Dark City (or in this case, RoboCop)

People who hadn't seen Ghost in the Shell or Dark City thought that the Matrix was brilliantly original. This 2017 Ghost in the Shell film could have followed that formula and at least tried to create something that seemed new.

Well, at least it leaves the door open for an indie production to create a faithful smaller-scale adaptation -- without much fear of comparison to the big-budget "authenticity" of this one.