I think it would be nice to allow mods so that the talented community can add more content and see if users can save the game
Nice? Perhaps. However, since GZ uses Apex engine and latter isn’t open-source (e.g like Unreal engine is), coding mods for it isn’t allowed/legal. Moreover, devs, themselves, have said that coding in Apex engine is one complex thing to do and the last i heard from devs, they do not plan to release the code for Apex engine.
Btw, game has autosaves, so, you don’t need dedicated option to save your game.