You don't but you don't notice if you never did anything like that. Half of the keybinds listed by 'stty -a' are a mystery to mankind.

You can unbind the Ctrl+V keymapping if you want, and it behaves as expected in emacs -nw at least. (There's a Ctrl+Shift+V binding set up by default, same as many Unix terminal emulators, so you won't miss out.)