I read your entire post.
What you are implying is something that won’t happen or that maybe will in a distant future, but we will never see the MC going John wick on every person in town rn, for multiple reasons.
First one this game is somewhat of a mix between a dark fantasy and a power fantasy, you can fail and every choice has some repercussions, but you can get also powerful, but not godlike, for a thing called ludonarrative dissonance even if you are 99+ level with all stats, you will be treated like the peasant you are.
Second one, as I saw while playing Chyos has clearly an idea were the story is going, you will probably one day have an heavy revenge on Thomas and Giron but not in violent and brutal way, it will be more subtle.
Maybe in an endgame you’ll become a king enslaving and murdering everyone, but for now, and for at least some years, you won’t.
For now the diplomatic way is the best, slowly ascending the ranks, obtaining power, this is how you become truly powerful in the story, in gameplay you’ll may be still OP but in the story you are still not something, but you are becoming one.