I've been the recipient of counselling over the years. I've never led or been a therapist myself, but as someone who has had counselling service, I could see how, if my emotions were disregulated by the tension in the room over a period of days, just having someone to discuss those emotions with, whether it was related to the people in the room.... We've heard that some jurors don't get along with each other. It could be related to a past experience that's now resurfacing, perhaps prior trauma that I've had that's now appearing amongst the tension of the deliberation.
If there are opportunities for jurors to be able to access someone to.... If the constraints of section 649 were still there, then maybe the content of what's being discussed would not be on the table, but certainly the processing of the feelings and the emotions might be a place for that to be released to clear the mind so that you could come back to the deliberation itself.