actually, I want to add to what I said before, something I want to point out about fantasy rpg settings in general.
So, there's this one story about people playing a table top game we call "Earl, son of Earl". In the story, the DM of the game was one of those egotistical, pseudo-intellectual types and he threw that at everyone playing. He changed the rules and calculations and would always kill or disable the characters of people who played physical classes saying that "in a world of magic, the intellectuals would dominate-blah blah blah". The story itself is just about how to effectively piss off this kind of DM and "ruin" his game. However, I want to talk about his and most fantasy stories mistaken assumption of a "designated mage" in a world of magic.
Take a moment to consider what would actually happen if you introduced to idea of magic into combat, war...dungeon exploration, what have you. The idea of magic is that there's some kind of break in physical limitations or the laws of physics. As challenges progress in an rpg or fantasy story, it becomes unreasonable to expect a swordsman's physical abilities to keep up with things like dragons or gods. The swordsman would probably have to adapt some form of physical/mental strengthening and reinforcement magics to stay relevant. Conversely, a physically weak, lightly armored, slow moving mage has no business being in firing range of a battle. So, I think that the scholarly, "designated mage" probably wouldn't be involved in fighting directly while every other sort that shows up in adventurer parties would actually be some branch of mage with the aforementioned swordsman, tanks working barrier magic, and traditional mages and all the other ranged fighters being merged into artillery as examples. For the thief type, the role that Saitou plays while they explore, they need to be able to deal with magical traps and can also use it to improve their own stealth. So, he'll probably need magic to improve his own specialties to handle more difficult things. Even if he can't learn to use it himself, he needs to gain some form of awareness and knowledge of it.
Most stories now work more like this and there are some who directly comment on it. Tower of God explicitly stated that "everyone becomes a Wave Controller (mage)" because of the reasons I mentioned about physical limits and the mc, a mage, also trains in martial arts, overcoming his melee and mobility limits. Really, I just wanted to point out the flaw in the traditional fantasy rpg setup. It's only if you assume that setup makes sense that makes it so he wouldn't benefit from learning or learning about magic.