@Doomer to be honest, we don't know if he's the most powerful in the world. This Inquisitor guy right here is an example of someone whose power is at least comparable and at best close to his. Plus, there's the heroes and the gods and whatever else could be in this world, so he can't just go...
@KamiKira00 a lot of the games in these isekai stories seem to be that way: extremely unbalanced, and with weird game mechanics that would instantly make it unenjoyable.
@Nakanowatari I guess his point was that if magic is primarily the working principle behind all of these technologies then it would be uncommon to specify it in the name. We had phones before smartphones, cars before electric cars, etc., we need specify those because they have a novel principle...