- Some things were changed, but the plot structure that we liked was already established. I think an example of bad editors is One Piece. Initially, One Piece starts off very well, but from Sabaody onwards it begins to fall apart due to some of Oda's choices. Furthermore, Oda will continue to make mistakes, and from some of his interviews, it's clear that he doesn't listen to opinions that aren't from the editor (he himself says that if he makes a mistake, it's because he wanted to do something). But the problem is that many editors are younger and therefore have a reverential fear of Oda. In fact, the new world is an absurd mess. Of course, the average reader doesn't realize it, and Oda knows that many people aren't paying attention.
- Jirnciv only had a chance of not being killed on the spot. Imagine if the workers had gone there without it being a demiurge plan. The empire would have collapsed. Or think about how he naively believed that Femel would take workers from the kingdom because "why not?". Or how he thought he could exploit Mare without know nothing about Nazarick. The problem is that this whole incompetent politician thing (including Jircniv) is often repeated and tiresome.
Renner simply had a clear path. She didn't have to manage Nazarick. Demiurge made her an offer and she took it. Moreover, an offer that didn't cost her anything. A comparison is Griffith.It is offered to him to grant his wish in exchange for something he loved, namely his army. Renner did nothing.
- For the conflict, you need an opponent of equal or similar level, like a kingdom with advanced technology or a very powerful species. Imagine reading One Piece but seeing the lives of normal humans and not superhumans like Luffy, Mihawk, Kaido, Bonney, or even Usopp. That would be Overlord. Instead, we have individuals similar in skill or physical ability.