Confirming - it's OK to set default watch for categories a user can't see

Great… I’ll be using this new feature to add all categories as Watched… It’s a far better user experience then Mailing list mode, and the unwatch this topic links in the emails are just fantastic.

I assume that people are likely to look at their profile & unwatch topics they don’t have permission to see. They may also wonder why they don’t have that permission. For that reason I have this request to make being added to a group auto-watch categories.