They have the highlight notification when you get queued into a match, so if you are tabbed out you can know that you are playing, if we are using your logic then why is that a thing? I don't code, but i don't think it would be hard to make whispers do the same thing. If im in a tourney and the server is full, im usually tabbed out until i play, and during that time i generally get whispered, and it would be nice to know when you get whispered if you aren't directly watching the game, because its nice to know when you are fighting when you aren't directly looking at the game.