For example, in the LSP repo, using lsp -l results in

lsp ➤ lsp -l
-------------------------------------------------------------------------------

                                --Regular files--

                                  --Text Files--
                           .travis.yml  
                            .gitignore  
                          arguments.go  
                     arguments_test.go  
                       CONTRIBUTING.md  
                                fmt.go  
                           fileinfo.go  
                           filelist.go  
                        investigate.go  
                               LICENSE  
                               main.go  
                              paths.go  
                             README.md  
                               sort.go  
                            tty_win.go  
                           traverse.go  
                               trie.go  
                           tty_unix.go  
                              utils.go  
-------------------------------------------------------------------------------
lsp "~/Dropbox/workspace/pulls/lsp", 20 files, 0 directories
 git repo (remote at https://github.com/siddharthist/lsp.git)

Where there are no 'regular files'. Therefore, there is no reason to print 'regular files'. Strangely, this behavior doesn't apply to the executable files heading.