If I were gonna write a story about Dyson Spheres they'd end up being a simulation, or maybe a civilization trying to build one & destroying everything in the process.
There's just no good use case for them. I'm not sure why a civilization with the technological capability to build a Dyson Sphere would need or want to build a Dyson Sphere.
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.
FTR my feelings about the #KardashevScale are pretty much the same as about the #FermiParadox: As fictional constructs, I guess they're fine, but neither really makes much sense when you step outside paradigm-boundaries of modern humans.
People take them so seriously, though.
FeralRobots