Redundant/Unused Feature on Battle.net app?

I really would just like to know what the purpose of “Remember Me” or “Remember Login Details” checkbox is on the Battle.net app? By the basic description one would assume that it is supposed to save your login details so that you don’t have to keep entering your password every time you open the app. However, this is not how it functions. I have to enter my password every time I boot up the battle.net application and then verify it with my mobile authenticator.

I’m honestly just looking for an explanation. Is this a redundant feature that no longer exists? If not, can someone please explain to me, in as much detail as possible, what the “Remember” function is for?