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Why Barbara no longer wears glasses in her civilian life. She was also not allowed to use computers, either. Gail Simone also mentioned that she had to fight hard just to let friends/allies Nightwing and Black Canary make appearances.
Also, the whole reason she's doing this "walking" thing again. Word of God is that Gail Simone only took the book because she was afraid someone else would mishandle Barbara's recovery.
Gail Simone stated that she was forced to make the book grim and gritty much to her frustration note Contrast her concurrent run on Red Sonja at the time, which featured the titular character poisoned to the point of blindness, and it was still tonally lighter.. She then decided to quit, but a new editor was hired and he encouraged the new creative team to make the title fun.