The requirement was ostensibly to reward members of Bethesda’s Doom Slayers Club for playing the original titles. While that’s a nice perk if you own the more recent Doom (or plan to get Doom Eternal), it’s a hassle if you just wanted a quick nostalgia trip.
There have been a few other complaints as well, such as the addition of copy protection, graphical changes (such as filtering that softens those 1993-era graphics) and apparent music tempo slowdowns on the Switch. That’s not including the removal of downloads for the old PS3 and Xbox 360 versions. It’s not a fiasco, but these clearly weren’t the straightforward ports some were expecting.
Update on our new classic DOOM releases:
The BethesdaNet login requirement was included for the Slayers Club, to reward members for playing the classic DOOM games.
The login should be optional, and we are working on changing the requirement to optional now.
— Bethesda (@bethesda) July 27, 2019