I tested this on a Rock/5.0 system. Would be great if other users could test this. Helps to eliminate mistakes and rewrite things if needed. Perhaps to rewrite so non-tech savvy users understand and so forth.
Reset root or user password
This is useful if one forgets a password or if one deletes the existing /etc/passwd, /etc/shadow, /etc/group, or /etc/gshadow during a dnf transaction.
Off topic but worth repeating: If you see a dialog during a dnf up or more likely a dnf dsync transaction you do not want the new file you want to keep the existing file. These files contain usernames and passwords. Keep the existing file.