This story is similar to a story that I have read before name "The Wizard World" (Except in that story the protagonist is extremely self-centred) . Here I'm not referring to the story but the story type and model. So because of that it feels kinda boring to me.
A very good story according to myself. The slow pacing technology tree is just right for a down to earth kingdom building novel. Genuinely I don't like those novel where mc reincarnated in mediaeval period and his people can't even read or right but suddenly after a few months of grinding they suddenly have tractor, excavator etc.
This novel depicted a mediaeval society very well and using subjects as warning was common at that time.
So, those who are uncomfortable with this novel please stop messing around and read something that suit your taste.
The only thing to complain is that I think if you(author) can remove the system and just rely on mc's knowledge (literally a genius mc though) than this story will have a more real vibe.