It is now roughly four years ago that blizzard announced the "Appear Offline" feature coming to the battle.net app. Unfortunately this seems to have been buried and left under the Soon™ category, this I believe is due to lack of support and really it's a necessary feature.
In March 2014 (almost two years after first announcement of the feature) @CM_Lore posted on twitter talking about technical problems encountered when developing the feature and so it was thrown on the back burners for now (Soon™).
With the launch of Overwatch the demand for the Appear Offline function has certainly gone up as I am sure we all have that one (maybe more) friend you enjoy playing other games with and is all round a good guy but clearly FPS games are just not their forte but you end up with that inevitable "Join Game" button causing more pain than what its worth.
It has been questioned many times over the years whether this function will even get implemented. We, the community need to give Blizzard a clear indication that it has strong support and we want this feature ASAP.
https://www.change.org/p/blizzard-en...e-net-petition