The Biden administration pretends at the moment that they want to create a new organization that works like Darpa and that's more open to innovation the way Darpa is more open to innovation. The announcement reads:
Launch the Advanced Research Projects Agency for Health (ARPA-H). The discretionary request calls for $6.5 billion to launch the Advanced Research Projects Agency for Health (ARPA-H) within the National Institutes of Health (NIH). With an initial focus on cancer and other diseases such as diabetes and Alzheimer’s, this major investment in federal research and development will drive transformational innovation in health research and speed application and implementation of health breakthroughs.
Part of what makes Darpa special that it's not told by politicians to focus on the problems that are most obvious to the politicians but is more free about chosing politicians. Focus on Cancer/Diabetes/Alzheimer's suggest that's not the case here as those are the traditional targets of NIH funding anyway. Does anybody have a more optimistic take on the annoucement and expect it to actually produce an organization that's comparable to DARPA?
I'm not sure to what extent there's such a thing as the purpose for which DARPA was founded, but it seems to me you could equally say that cancer, diabetes and Alzheimer's aren't the purpose for which ARPA-H is being founded (assuming it actually happens); they're merely current expectations for some of the first things it will work on. So I'm not sure what distinction you're drawing htere.
Perhaps if I were more familiar with the structure of the relevant US agencies it would be clearer to me, but as it is I don't see how you get from "It will be part of the NIH rather than part of the OSTP" to "it will be more politician-driven than DARPA".
The article in Science quotes some people who think ARPA-H will probably do well and some who don't. This isn't terribly surprising; I bet that if the administration had issued a similar announcement but had said that ARPA-H would be part of the OSTP, they'd instead have quoted some people saying "It makes no sense for ARPA-H not to be part of Health and Human Services; I'm worried that it will end up wasting money on projects that don't really have anything to do with health" or something of the sort. (I remark that the alternative mentioned in the Science article isn't "part of the OSTP" but "a standalone part of DHHS".)
This is looking less and less like a real question and more like you just wanted to complain that the proposed ARPA-H isn't what you'd like it to be.
(For the avoidance of doubt, the above is not a coded way of saying that what you'd like it to be wouldn't be an improvement. I don't know enough about these things to have a strong opinion on that.)