Thanks for that clear explanation, Sara - much appreciated.
This seems a very narrow use-case (tracking does not send notifications). I guess it would be useful for announcements, where subsequent replies are of virtually zero interest; I’d be happy with them being ‘tracking’ though. Perhaps I lack imagination.
Personally, I’d much rather that Watching 1st Post was included in the deal with Tracking and the option removed from the default menus as it doesn’t make a lot of sense as is.