Been using Kakoune for .. no idea, a year+ now after many years in Vim. It's great. It has some things I dislike (like reliance on shell for idiomatic plugins), but overall the meat of Kakoune - ie the selection based editing is something I cannot live without.

These days I tire of Terminal programming and have been wanting to escape it for more rich UIs, but while I have been searching I am confident my end choice must support modal editing and selection behavior akin to Kakoune - so I can replicate the UX of Kakoune. As it stands I imagine my choice will be Xi Editor, once it gets better support for modal editing and multiple cursors.