I've not watched the show (it's on even later in Scotland), but from the clips I've seen online the physical layout for debate and conversation seems a bit awkward. I'm guessing coffee tables are out of fashion on these types of show now.
The layout isn't much of a change from the original concept at
TLS, or indeed what is used on Marr to a large extent.
A 'hard interview' area (albeit with a comfier chair than on Marr), and a soft 'guest area' to provide comment without being 'grilled'.
Peston is all politics, so the desk is a better vehicle for the presenter; whereas Marr has an additional arts element which makes the sofa better for the soft interviews/discussions.
One thing I didn't initially like about the new Peston set is the lit curtain backdrop. It made it seem as though they were just covering something on a temporary basis.