Although I've always loved mystery and crime fiction more than anything else, I was 'raised' by science fiction writers. I got in to the Clarion Workshop when I was a complete newbie, and I have a strong network in sf.
But lately I've been trying to build a network of mystery writers, I'm finding it kind of a culture shock. Among sf and fantasy writers, you have to beat off critique partners with a stick. I have been poking around various mystery forums and groups looking for someone to trade chapters with.... and I've had zero luck. None at all.
It's making me wonder, though, if maybe the heavy reliance on workshopping and critique groups in sf is something of an abnormality. Is it just that mystery writers sauve and sophisticated professionals who don't have time or need for much workshopping?