"Making friends" is more technical than "learning math." But more importantly, having friends helps more with technical problems than, say, knowing some technology that doesn't apply here. Same for resiliency.
This was an off-the-cuff response, but it's a genuine one, particularly with skills "for the next ten years." I've hired a lot of developers over two decades, and some of them have done good work for me for a long, long time.