Earlier quoted context omitted.
One of the few people who are actually competent. Although most likely she’s well compensated, and doesn’t have to waste time on useless efforts at work, this level of discipline and striving towards a goal is just very rare in general. Possibly also no family, limited social life and no other hobbies.
One of the unspoken benefits of being young, you're unlikely to have grown into a management position and can focus on not-management stuff.
Every person is different of course, there might be this one brilliant engineer forced to manage against his will somewhere.