I know a Dyson sphere is all about maximising energy capture but the thing I've never got is what do you do with the actual
people? Planetary atmosphere is held on by gravity. The 'floor' of a Dyson Sphere (necessarily) doesn't have enough mass to hold an atmosphere on the inside, the strongest gravitational force is generated by the star itself. Exit atmosphere, the same applies to objects and people!
You could make the sphere double walled with living quarters between (a pretty miserable existence) but again where do you get workable gravity. The Star's gravity wouldn't be enough to hold you comfortably to the inner floor.
You can't spin a sphere... well you
can, but not in any way that equalizes centripetal force over the surface - there's going to be an awful lot of unusable uphill, both for atmosphere and ability to walk up it.
Now Larry Niven's Ringworld (or a Dyson ring) I
do get. You can spin it at a sensible speed to generate 'gravity' and retan the atmosphere between high rim walls. Of course you still have to worry about maintaining stability etc. but at least you have somewhere to put your population. And people won't blunder into you in the dark.
Dyson sphere: There, finished it! Err, who turned the light out?..... Damn!