When entering names on Unknown faces, it seems far too easy to change the case of a name.
In almost all cases I use, the first letter is capitalized. When entering a new label it seems that by mistake, it is all to easy to change the case to all lower case.
If as can happen the labels applies to 1000 images, then these all show up as "Changed in catalog" and require saving. If you do not notice immediately, then they need to be re-saved later when you notice the change and then correct the error.
This is a massive waste of time and backups, as each change not only is reflected in the original, but in all the backup versions as well