I've taken a look at kakoune. It's very similar to vim, isn't it? When I say vim, I also mean neovim, which currently is already superior to vim in a lot of ways.
The author of kakoune initially intended to rewrite vim from scratch, so there is definitely a similarity. A big difference is that kakoune operates in terms of selections rather than motions, with built-in support for things like multiple cursors as well. I find it more intuitive to use than vim, and just as powerful.
Yes, I do use it as my main editor (I have "vim" aliased to start kakoune instead). Knowledge on how to use kakoune doesn't seem to interfere when I need to use vim for some reason (such as ssh-ing into some machine that doesn't have kakoune).
