That’s neither efficient nor optimized, just a bogeyman for “doesn’t work”.
Of course destroying the planet to get iron from its core is not a popular agi-doomer analogy, as that sounds a bit too human-like behaviour.
Of course, I hope to be uploaded to the WIP dyson swarm around the sun at this point.
(Doomers are, broadly, singularitarians who went "wait, hold on actually.")