Add Undo Batch Rename

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.