Nice strawman. Either way, you need new physics (to build a structure that large), so why not have a little more creativity while you're in the process of blatant speculation?
Here are some other ideas to consider, which would be more practical than Dyson Spheres imo, and don't require more deviations in currently known physics than the construction of a star-sized solar panel:
- a civilization which has discovered a means to efficiently transform atomic mass into energy with arbitrary elements not considered good candidates for fission or fusion.
- a civilization which has a means to extract work from zero point energy.
- a civilization which is power efficient enough to never need an entire star's worth of energy localized in a single solar system. Note that John Von Neumann's brain consumed about 20 Watts of power.
Obviously, there is no right answer, because we aren't there yet. But the point of the original comment is that the ratio of media about Dyson Spheres to other speculation is really unbalanced for how impractical/uncreative (in this day and age, not when they were conceived) of an idea they are. No need to get combative about it.