Not to mention, if his stats are that high for strength and dex, he would have ALREADY found out.
With stats that high and his lack of control for them (like in magic), when he opens a door he would probably destroy it, same when he jumps and moves, his body would not be accustomed to such strength...
But we don't see any of this, only for magic.
The setup of this manga is the stupidest I've seen in a long while.