Quote:
Regarding the gravity issue, all you have to do is spin the sphere. This will get you a band of living area around the middle or the sphere orthogonal to the axis or rotation.
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No, it will not. "This" will get you nothing but a massive pile of wreckage, because spinning a Dyson Sphere would create destructive stresses that would tear it apart.
And you have
not answered the "need question," because
there is NO such "need." No race could achieve the level of technology necessary to build even a
Ringworld without having already overcome
all of the "needs" that might have made one desirable in the first place.
Please stop pretending that you know what you're talking about, and go read the Dyson Sphere FAQ, to which I've already given you a link. Star-enclosing Dyson Spheres are
not scientifically plausible; and while a Ringworld
might be plausible, it's still
irrational because it's totally
unnecessary to anyone who could build it. Both of them are Science
FICTION.