[lacn]

What's most interesting to me about your point compared to parent comment's is that you're saying "statically, over all time, the most valuable thing to do among all your choices is to understand the business," whereas the parent is saying "dynamically, in this moment, what is most valuable thing to do in this iteration of my actions?"

I think your question is most interesting in terms of long term skill mix or "skill portfolio" a.k.a the career viewpoint, while the parent's is more interesting on a day-to-day basis as you navigate the state space of bringing a project to completion. On a given day, understanding the business may not be the most valuable thing to do, but to your point over the course of a job or career it probably is.

(For example, I can say that I already have sufficient business context to do my programming task for tomorrow. Asking more questions about the business would be wasteful: I need to go update the batch job to achieve the business outcome.)

EDIT: I might go one step further and say the most valuable skill is not understanding the business but understanding how to match and adapt technologies to the business (assuming you want a career as a programmer). Ultimately the business drives income, but presumably you have a job because their business requires technology. So the most valuable skill is, as efficiently as possible, making the technology do what the business needs. That's more of a balance / fit between the two than just "understanding the business."