Isn't there a energy cap per day which means he isn't able to get "hundreds of billions of energy" in a year. And yes he later can but, if I'm understanding correctly you are at the point where he doesn't have a super OP body which suggests you have read up to chapter 356. Also you obviously want a fast growing character thats OP from the start considering your argument to slowing the novel down somewhat and not making everything fast paced is that "it is very dumb". For your second last point I think you are wrong at this point in time. The three chapters per week has changed to 1-2 chapters per day. As I see it this novel review gets a 2 out of 5 from me.