"Why are you doing this again?"
Because I still see Celestia as prejudiced against changelings and quick to act when faced with them. My view of Celestia in the situation hasn’t changed, nor has the history and reasoning behind it. Things are different from how they were in the earlier iteration of the Canterlot confrontation, but that doesn’t mean that I was ever going to have Celestia open to the idea of peace with changelings.
How do you figure Celestia’s prejudiced against changelings?
I figure it following the history that I’ve worked out for the blog centered around changeling-pony interactions since the founding of Equestria and before the rise of the alicorn sisters. I also figure it from the lack of any form of a diplomatic attempt by Celestia during Chrysalis’s invasion despite an opportunity (not saying Celestia wasn’t right to be blunt and aggressive in that situation, she often is).