While this is not a big issue, it means that you'll need an extra launcher installed if you are going to play Fallout 76, and those are not in short supply these days. It's possible the company is looking to determine whether or not it needs Steam to reach most of its audience, or if people will be content to purchase its games without involving Valve. That's not to say it won't happen eventually, but it may be quite a wait if it happens at all-Fallout Shelter was released on Bethesda.net in July 2016, but didn't make it to Steam until March 2017.
"The PC version of Fallout 76, for both the B.E.T.A. and the launch, will be available only via Bethesda.net, not on Steam", a Bethesda rep said.
Bethesda joins other publishers in making its next, hotly anticipated game available outside of Steam. Bethesda confirmed this long running rumour to PC Gamer. Some had assumed this would be the case, seeing as the Steam logo didn't appear anywhere on the site, and no mentions of the platform were made in the FAQ itself.
We recently reported some pretty solid information revealed by Bethesda regarding their upcoming online title Fallout 76, including how the entire game will be available at beta.
Steam really has been the platform of choice for Bethesda over the last few years. Fallout 76 looks to change that, though.
Fallout 76 is one of the most highly anticipated games coming in the second half of 2018 and ahead of the launch Bethesda will be running a beta period. Specifically, the publisher/developer added an answer explaining that the beta will feature the full game.