I agree with you, for "read-only" ntfs, should do so.
ntfs-3g is not present in the original image (not the package). Since the full functionality ntfs not expected, there is no need to ntfs-3g.
Sorry, I do not have in-depth knowledge on this issue.
For the image of users:
If ntfs-3g has been set by the user, only then it should be removed.