This rant below is more on the direction of the manga:
One thing I don't like about cheap power manga is that the mc is a literal dipshet at valuing his worth and actions which can obviously be classified as 'common sense'.
Contributions: mc literally increases their technology by 500 years, saves the kingdom multiple times, creates a method to mine 'national treasures' (the ore for the barrier), and creates a capital wide barrier that never existed.
Problem: He knew the kingdom was in trouble and not advanced. Every time there is a problem, the mc understands the consequences and issues involving it. But, after he fixes things, he does not see how much progress he has brought. He also knows the problem and is thorough on his knowledge, but, once the issue is resolved, he never mentions or reflects on it ever again, or the story forgets it ever happened, leaving with "rumored second academy students."
We have even seen the king ask MC for anything he wants, even becoming king or the kingdom.
Up until now, we have seen no struggles with other political powers, thus, this kingdom is the only governing power and forefront of humanity. If mc doesn't want land and treasures bc he doesn't want to manage one and aren't good enough, he could at least have the king put his power above the king, AND mc doesn't have to govern; it has been shown even though he is hesistant with governing because of his 'objective' of becoming strong. It has been shown that MC still acts in states of emergency or whenever humanity is in danger (ie. demon case from beginning to end),
THUS, he can train as much as he wants, WHICH is the
WHOLE PREMISE in the beginning. He could even just request for a specific insignia identifying himself as a power next to the king or announced as an unrestricted S-rank knight of the kingdom for travel purposes, so, this arc with the corrupt noble would not even exist in the first place.
Maybe the
author chose a mc that accepts no rewards in order to follow the probable purpose of this manga: for depraved Japanese salary men, who have obviously been shown to be bullied, hopeless, and concentrated in actions with the Japanese 'culture' of being humble and 'quiet' when doing a great deed or being taken advantage of. That last part describing them was more of a complaint, but, with the culture I'm from, it seems incomprehensible people could stay 'quiet'
edit: grammar. Another complaint with the author's approach to sweep things under the rug with mc's actions is that I think most people including myself like this manga bc it is battle manga with magic and meaningful increase in strength. of supporting characters.
Thus, if mc asks for a badge that recognizes him as a power next to the king, the author can just focus on the developments as a battle manga. Just sprinkle in times when the stupid nobles get kicked around bc of their stupidity to satisfy the depraved salary men, and then, the manga can continue as a battle manga. Because in the end, this manga isn't very good at bringing anything interesting or entertaining about the stupid nobles. They keep their power and lack of awareness throughout the story and only lose their hair.
@flannan thanks for the insight