I just batched renamed all my photos in a gallery. I wish to undo this. After some research I realized that I could've gone back to the original file name, if I had checked the "preserve original file name" box. I did not. Why isn't batch rename easily undone? I mean really. A lot of people have had this problem over the years if you look at the forums. I don't understand why Adobe doesn't just make this changeable by a simple undo command.
Let's say you batch rename 3,000 files and then want to revert them. Bridge would have to use RAM to keep track of 3,000 changes. This is why writing the change into the files is the supported method if you want the ability to revert filenames.