Thankfully, the series does have a certain amount of character development, where it shows the MC is just being naive. It also shows the price of that naivete. But he is also stupid in that regard though. You encounter something that is referred to as "lord of the skies" and still think to conserve CP. That's like suddenly encountering a tank with infantry-based loadout and still insist on defeating the tank with said loadout when he can spawn weapons.