1. The question is answered by Occam's razor
2. Regarding sustainable energy https://dothemath.ucsd.edu/2011/07/galactic-scale-energy/
So pure intellectual mastrubation
Let’s laugh in the face of thermodynamic limits and talk of 100% efficiency (yes, we have started the fantasy portion of this journey).
1. The question is answered by Occam's razor
2. Regarding sustainable energy https://dothemath.ucsd.edu/2011/07/galactic-scale-energy/
So pure intellectual mastrubation