@FgoSegul He KNOWS he's so OP. He's had his previous life's effort and knowledge along with the best possible starting point of talent. He just doesn't give a damn about anything else outside of magic research. And those nobles at the prologue highlight that no matter how much effort and knowledge the MC put in his former life, without the natural aptitude and talent from being of noble blood (in a world where magic aptitude = nobility), he can't do jack shit. Now that he's got the BEST start...
Yes, he KNOWS he's OP. So OP in fact he only really cares about magic research, and everything else isn't interesting enough for him to seriously care about.