After various discussions, including here at the summit, I'm seeing a rough consensus that the <private/> element in Carbons or the ~equivalent <no-copy/> hint in XEP-0334 cause more trouble than they are worth.
The only use-case I've been able to find is preventing OTR messages from being received by clients that cannot decrypt them. It is debateable whether receiving garbage is worse than not knowing that someone is trying to contact you on another resource. As the elements are basically only a workaround for OTR, and OTR is a hack, and OTR has its own methods to solve this issue, one could argue that we shouldn't be using these elements. Does anyone have strong feelings about this? Regards, Matthew PS. I don't want to get this discussion tangled up with the advancement of Carbons, right now I'd rather just determine whether these elements are useful or not.
