Software comes in many shapes and forms. That it has to be a kernel extension in this instance seems a bit of an odd thing to complain about. I'd be much more

Software comes in many shapes and forms. That it has to be a kernel extension in this instance seems a bit of an odd thing to complain about. I'd be much more concerned if Karabiner couldn't exist in a future OS X. That you can have it, use it and have it work well is more important than the mechanics of how it works underneath.