The MC is a natural airhead and this is from the start meaning even when the MC was male so do not think the MC suddenly has a personality change.
I know a lot will feel that the MC who was originally male showing signs of falling for a male character as a bad thing but after what happened at the beginning I think that has been perfectly vaporized and sent to the vacuum of space. Also the MC is now female and it drove me nuts when so many of these male turned female just go right into the yuri rout.
This novel started out great then it just turned into a cycle of MC finds people he doesn't like or strong communities that are stable and destroys them half the time using sh*tty reasons so that he has a bigger army. Then after he stabilizes a little a random monster will swoop in usually of a high lvl that has not been seen before that he ends up killing but not before transporting him very far away, two were by birds, one by a boar, once by a nether beast that teleported him, even the weather will pick him up with a random wind gust.
The author is beyond reason racist to the point he just looks for an excuse for the MC to destroy all other countries and turn the people of those countries into slaves. For some reason the other races are just as racist and super vile it does not make sense. Heck he thinks all white people are blond white supremacists, he even went so far as call all gypsies prostitutes.
This was mentioned in a few other posts but all women are prostitutes in this novel even little girls.
Yes society would deteriorate in such a world but not to that degree because human nature prefers structure and those that are against structure in any society will naturally be expelled.
An example is there is mechs however the only description that is given is color or size but doesn't explain at all how they look beyond that other than one mention that some may look like armor. Unless the item is something that was used in the ancient times or resembles something from those times the author avoids talking about them all together. I really had no clue the period was set more modern until it mentioned trains and buses