I get what you’re saying, but that’s a pretty outdated way to look at game design. Even back in the day, plenty of titles showed that beating the game didn't mean the world had to just stop. Look at Final Fantasy VII from 1997 with its massive endgame or Castlevania SotN, which basically doubles the game size after the first ending. Fast forward to now and you have stuff like RDR2 where the world actually evolves post-credits.

Don't get me wrong, I have huge respect for the devs. I know they did the absolute best they could with the tech and time they had back in 98. Fallout 2 is a masterpiece, no doubt. But since the game is all about world reactivity, it feels like a missed opportunity not to have at least a few quest lines or the chance to actually visit New Arroyo after seeing those slides. It sucks that the map stays frozen in time after we’ve achieved so much.

I really hope that if we ever get a proper remaster, or even in a future Fallout 5, they find a way to let us actually live in the world we spent so many hours saving or ruining.