Hi Dan,
I'm just now looping back to this and apologize for the delay, and it'll probably be another several days before I check this thread again.
My current thinking is that the portal is more of a content page than technical infrastructure. For that reason, the decision-makers about the content of that page should be the community, not WMF. Perhaps there has been a community discussion which specifies the scope of decisions that the community is willing to delegate to WMF, but I'm unaware of that. I think that such a discussion should happen before WMF effectively takes control of the page content. Otherwise, to me this looks like scope creep by WMF over a content page.
It sounds like WMF is collaborating with community members regarding page content, which is good. It seems to me that there should also be some specifications about which decisions get made by WMF and which get made by the community. Otherwise, this ambiguity is just asking for trouble.
Thanks,
Pine