Used to be on a 'worldbuilding' group on FB & boy howdy some dudes (always dudes) there were OBSESSED with #KardashevScale ranking. But in this deeply weird way - like, "my WiP has a K5 [sic*] civilization - what kinds of clothes should they wear?"

I'm pretty sure a "#Kardsashev 5" civilization is gonna be beyond our ability to comprehend. Hell, that's probably true of K2.
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*this would inevitably generate utterly epic 'well actually' subthreads nitpicking the vagaries of the Kardashev Scale.