As someone deeply invested in Emacs who had a short fling with Kakoune a few years ago I'm super curious how did you manage the transition? I have lots of notes in org-mode and rely on packages like Magit and so on, due to that I'm always wary of the fact that a lot of my computer use flows through Emacs (for better or worse).
Also one thing that intrigues me about Kakoune is the possibility of writing CLI utils in whatever language and then calling them from Kakoune. The same can be done from Emacs but generally you'd go for Elisp instead.
I've also found I miss fancier text decoration like subscripts, bold, italics, underline and mixing monospace with another font when not using Emacs.