Killer features for me would be remote file editing(using tramp) which is much more convenient than using vim over ssh, easy record replay of macros, rectangula

Killer features for me would be remote file editing(using tramp) which is much more convenient than using vim over ssh, easy record replay of macros, rectangular edits, integration with gdb to work as a lightweight convenient GUI, convenient use as a file manager using dired, horizontal vertical window splits( even having synchronized scrolling), and all these out of the box with no additional packages/configuration required. Emacs is truly batteries included.