I had very similar thoughts.
Current world is endless so everything that happens in it seems inconsequential. There’s a limitless sea of loot and zombies out there, so nothing really matters. You can burn entire cities down without giving it much thought. There’s always the next one.
A closed world is a perfect solution to many problems of the game. If the world is limited and the mycus or triffids will eventually cover everything unless the player stops them… Well we’ve got ourselves an endgame people, finally!!! This is perfect.
This also makes playing new characters on the same world more rewarding.
This would also somehow justify my pathological hoarding.
I fully support this.