What would you say is a better signal of a healthy career (one that will grow or lead to dependence on your activities for decades):
Learned a few skills, but the most important one is the ability to just grind. He grits his teeth, you hand him more and more of the same shit, but he just keeps knocking it down. This guy is dependable and you know he can handle that task well. Steadily busy because task is part of the every day grind.
Learned more skills than actually needed for job. You keep asking him to do more as he goes above and beyond. But you never look to him to do the same task over and over in a reliable way like Guy 1. Rather, when there's a problem, you go to him to seek help. Tasks are somewhat more discretionary (on as need basis) because if you don't have exotic problems, there's no steady workflow.
Curious on all thoughts because I would be amazed at a right or wrong answer, and personally have no idea what the answer is.