The game warns several times in several ways you before you do it, and it is absolutely not necessary to enjoy the game. And people who know the reasons you'd want to NG+ because they read spoilers? They ALSO know that they're going to lose the previous playthrough well before they've gotten too deep into outpost design.

When a dev says that the game doesn't really "start" until you finish the main story, I feel like that means it is actually necessary to enjoy the game as they designed it. The game was designed with this form of NG+ from the very beginning. It's a bit like saying you can stop playing Nier: Automata after 2B's story. Sure, you can, but it's super not what the devs intended. Not engaging with NG+ is an option the same way quitting MW2 before No Russian is an option.

And for people who know the reasons you want to NG+, that causes a conflict. If I know from the start that I'm going to be ditching this universe, I'm not going to be invested in what it has to offer. When I reach the end of the game, _____'s death wasn't a big emotional moment because I never spent the time to develop a relationship with them.

NG+ has been sorely needed in Bethesda games for a long time, but saying this is what we've been asking for is like saying FO76 was the multiplayer Fallout experience we were asking for.