Sorry, but that’s really not logical.
I have my own filing system. All images are IN the wp-content/gallery folder. But inside that folder I have my other folders organized. And when I want to add new gallery, I want it to the path wp-content/gallery/folder_1/folder_11, then the other gallery to have path wp-content/gallery/folder_7/folder_22
But locking the ability to change the path to the new gallery you are setting unstructured folders inside the wp-content/gallery folder (or whatever folder is chosen in the settings).
Please open the option of changing the path to the galleries inside the wp-content/gallery folder.
Thank you.