The realm status page need to be removed entirely. It is a relic of the old days when servers were individual, and there was no Battlenet Service as a gateway to the game servers. It only shows the realm status, not if you can actually get to it. If the Auth servers are down, even if they are up while they work on them during Maint, you can’t log in to the server.
That is not going to change. The most they will do is remove it totally, I hope.
The place to look for status on servers is the Launcher or the Support page.
Each game tab on the Launcher will have the Maint or emergency issues for that game posted. For Battlenet as a whole, it is up at the top right of the launcher usually as a 
sign. That tells you if the login services are having a maint or issue as well. That can impact many games and services.