I tried the idea of using `jk` in the past and found that it surely cannot be a perfect replacement of Escape.

Say I perform these mappings:

  :noremap jk <Esc>
  :inoremap jk <Esc>

Now granted, pressing `jk` in insert mode escapes me to normal mode. But many use cases that work with the Escape key do not work with `jk` anymore.

For example, try:

  :ab hn Hacker News

Now type `hn` in insert mode and press Escape, it would expand to `Hacker News` like it should. But then type `hn` in insert mode and press `jk`, it does not expand to `Hacker News`.