We have examples from the Gail Simone run where she was actively told not to use elements of the Rucka run when she wanted to reintroduce ideas from that run so your argument is not true.
Oh, it's true all right because not every book has the same writer or editor if you think about it. Some editors give their writers (like Bendis) a great deal of leeway using earlier material in their stories while others don't. For example, in
Green Lantern Corps there doesn't seem to be any problems for writers bringing back earlier characters and revisiting events that even predate the nu52.