Merlin, you don't know vi. You've been halfheartedly trying to learn it for several years. You're a fanboy of something you don't even use.

All this implements is a few of the simplest movement and insertion commands as simple keybindings. In terms of actually trying to use it, it behaves completely differently from vi/vim. The way the multiplier works with movement is nowhere near as robust as the way it works in real vi. No s/foo/bar/g. No commands beyond :w, which just presses Command-S for you. Nothing that uses control or alt. None of the stuff that works while you're in insert mode. None of the alternate input modes.

The only things that are implemented are things that map directly and easily to existing bindings. This isn't vi, this is the scum of hair and skin cells left on a vi user's razor.