I actually had no idea about the collars until now

Which is kind of sad, really - though I don't think it's any one person's fault. Speaking from a purely generic standpoint, I think we should, collectively, be communicating about this sort of thing a lot more. It might be a bit of a bother for some, but ... in the long run, it makes things run a lot more smoothly. I honestly thought this was what the Watch community was for, but I've hardly been seeing anyone use it for that sort of thing.