At best you have someone who is basically an idiot savant. At worst, you have someone who has forgotten basic life functions, but handles being a soldier like the best of them.
From both an industrial and military perspective, this seems like a feature, not a bug.
In fact, it really brings to mind a similar fictional concept, stylized Focus, from Vernon Vinge's Deepness in the Sky. Here, Vinge describes how teams of these "idiot savants", specialized in a certain area, are led by neurotypical managers who direct their output toward broader strategic goals.
If this was repeatably and broadly applicable in human learning, I could definitely imagine this achieving widespread usage, especially in developing countries willing to exchange personal well-being for collective (familial or societal) success.