That was a fun video, thanks for sharing it.
I remember eyeing a Benchmade LFK back when they were in production, but never pulled the trigger on one.
While I admire the ingenuity that went into some of these designs, I have to wonder how practical and robust they would be under real world carry and use conditions.
At some point, if what you really need is a fixed blade, then it probably makes more sense to just carry a fixed blade.