This will sound so trivial. But what got to me the most about the recoloured version was the removal of the yellow Bat octave on Bruce's costume. It was like they said, 'oh this story's too serious for that.'

However the story was set in a very specific time frame with it effectively setting up Barbara's transition into becoming Oracle. Bruce wouldn't lose the octave for a while yet in the old continuity. Plus you want the distinction of that 'present' day Batman contrasted to the early one in the Red Hood encounter.

So changing his costume just to make it more 'grimdark,' without even considering the time period it's set in, just undermines it all for me, for the silliest of reasons. So unnecessary.