Since the middle of 2015 or so What's in a Name? K.J. Parker, Revealed - Reactor
I was the editor on four of Ruth’s books, as well!
I never thought the Rendell/Vine difference was anything as extreme as, say, Westlake/Stark. Try the Rendell A Judgement in Stone or The Bridesmaid or Heartstones for some really terrifying “psychological” shivers.
Possibly it’s because I’m not a fan, but that’s not really sufficiently radically different for me, and it’s a different style, not a different viewpoint IYSWIM.
Anyway, despite having mooted it in the OP, the lack of political authors so far is conspicuous.
The closest I can come to a political example is liberal Stephen Colbert, who writes conservative material under the pseudonym Stephen Colbert.