Git Interactive Rebase Tool – terminal based editor for interactive rebase

How is this different from "git rebase -i"[0] and a reasonable setting for "$EDITOR"?

I thought maybe it was the "exec" but that verb seems supported by vanilla rebase, too, and I just didn't recognize it: https://git-scm.com/docs/git-rebase#_interactive_mode

0 = https://git-scm.com/docs/git-rebase#Documentation/git-rebase...