Yes, such a construct would defy common sense, if a civilization could build something like that they could certainly harness energies we couldn’t even comprehend.
Harnessing a star’s output is a rather modest proposal, it would be unneccessary for them.
I don’t even see how a Dyson sphere or a ringworld construct would in any way be preferrable to multiple, large, cylindrical colonies placed at strategic points throughout various star systems..
i was just reading how they are considered unstable.
now if a society at our technological level can figure out that these things aren’t even stable, wouldn’t a society at a higher technological level be able to figure this out too?