There's an RC in my shul. Never published a sefer, not what you'd call a posek. I'll text him basic questions (especially about other hechsherim
), but not if I think it's an issue that requires a 'psak'. What I will say though is that our Rov consults him about a lot of kashrus related things. The RC's are expected to be experts in the the metzius, in the facts on the ground, of whatever the issue is. That allows them to lay the framework for a posek to pasken on.
ETA: That's not to say that some (or many, I have no idea) aren't poskim in their own right, or haven't written seforim, etc.