Originally Posted by
Light of Justice
I think it more depend on his writers. Damian is a very difficult and complex character, so every writer will have their own understanding of Damian's personality, to the point that you can feel the difference when Damian get shifted from one writer into different writer. Also, almost all writer seems like want to write his redemption or character development from beginning so they must regress his character when they first wrote him to make a plot for his development. Even good Damian writers like Tomasi, Seeley, and Gleason did that.
Wait, when did Damian eat meat in preview? About him became vegetarian, it's kinda inconsistent. In Batman&Robin's Tomasi he ate chicken, in his Supersons he ate veggie kebab, then on Robin anniversary he ate burger. Under King's hand he ate burger, under Bendis he ate hot dog, I also recall he ate pizza on but I don't remember the issue, also on Batman vs TMTT movie he ate pepperoni pizza.