Well, if you are a Steam gamer, then anything else must feel like a burden. But, seems like Bethesda does not care.
According to the new announcement, upcoming Fallout title, Fallout 76 will be exclusive to Bethesda.net. and the game will not launch on Steam like others. This is what FAQ says:
Both the B.E.T.A. and the game will be available on Xbox One, PlayStation 4, and on PC (via Bethesda.net only).
Well, this means that you need another launcher in order to play Fallout 76. According to the announcement, the beta version and the full version of the game will act the same. Also, the beta will contain the full game and all of players’ progress will be saved for launch.