I added product designers (i.e. anyone making software for users) as a stakeholder.
I am very very very very very very skeptical of this whole workflow language idea. What began as the need for better localization of tools like PageCuration, and a vague but promising idea about using ContentHandler to help give pages more structure, has morphed in to a convoluted and over-architected idea. And that goes for whether the particulars come from fundraising or product or design etc.
I could go on more of a rant here, but suffice it to say I think we're missing a compelling rationale for why we need a workflow language. I commented as much on the Talk page.