I agree with you honestly but the MC in this case literally does have a power. He went back in time or had a reset and with that he has the power of foresight to be able to prevent or outright change history. That as a power alone is already incredible but it's not omnipotent as it's one flaw is once you change something you're effectively in unknown territory but that doesn't mean you couldn't still plan or prepare for things. Also the concept that not having any real strength being solely attributed to physicals prowess (as I think you mean, if I'm wrong I'm wrong) is just kinda a weak argument.