The Office of the Chief Scientist does more than just weigh in. The Planetary Society had been trying for 25+ years to put a mic on Mars. We'd sent cameras to mars, but we'd never sent a mic. It was a combination of denials ("there's no real scientific purpose" was the pushback) and bad luck (the first mission in 1999 crashed so did another - more here, https://www.planetary.org/sci-tech/mars-microphones ).
Here's a Web 1.0 page from the 90's on it, https://research.ssl.berkeley.edu/marsmic/whatisit.html
We finally got a microphone on Mars in 2021 thanks (in part) to the Dr. Jim Green. At the time, he was the head of NASA's Planetary Science Division, and along with his colleagues, he put his weight behind the payload and helped get it past the bureaucracy. His push wasn't the only push. A LOT of people worked on it, but it was an important one.
He is also the reason why NASA got into Planetary Defense. He also pushed for the NEO Observations Program. I remember talking to him about this a few years ago. IIRC, he pushed for the creation of the Planetary Defense Coordination Office (PDCO) to make an explicit Planetary Defense team within NASA.
He also helped refocus NASA on the search for life on Mars. And as Chief Scientist, he started putting his weight behind terraforming Mars, https://www.nytimes.com/2022/01/02/science/jim-green-nasa-ma...
Every large organisation, every bureaucracy needs someone like Jim to get interesting ideas across the finish line.
Jim consistently did that across his career, and the office of Chief Scientist give him the ability to seriously advocate for "crazy stuff" (not his words) like Martian life and terraforming.
His successor is much the same. I think this closure is a net loss for humanity.