Yes, I’m more in line with Casper’s thinking as well. Jobs-as-Progress is a great way to ensure you’re not being too narrow in your thinking and strategy too early, and Jobs-as-Activities seems like an effective approach to understand what is wrong with current solutions.
Both are required to identify and understand innovation opportunities.
I think it would be detrimental to shun one over the other in an absolutist sense.
In fact, one may even argue that the house building example in this article is a direct application of both styles of JTBD. The modern building techniques are borne out of:
1) understanding that people want to move into affordable housing and structures quickly (Jobs-as-Progress) and
2) handsaws are too time-consuming and harder to scale (Jobs-as-Activities).