usefulness of -I

[noraj]

  -I, --injectclaims    inject new claims and update existing claims with new values                                                                                                                                                         
                        (set signing options with -S or use exploits with -X)                                                                                                                                                                
                        (set target claim with -hc/-pc and injection values/lists with -hv/-pv

What is the use of -I? I mean injecting claims could be automatic when -hc/-pc/ -hv/-pv are used.