I think it is good design for a game to give a sense of closure to the player. You have reached the major goal of the game. Now you can move on to other things

I think it is good design for a game to give a sense of closure to the player. You have reached the major goal of the game. Now you can move on to other things and it feels good. I still boot the game from time to time when I want a low energy activity. I go through the moves. Bootstrap base, then smelting arrays, etc. I try to innovate on some designs a bit (mainly to make things more modular/scalable and avoid having one big resource bus). I find it relaxing.