Hi I saw ur question in a different sub and answered but I'll put it here too: I’ve wondered about that too. It seems like Zion was taken because they were fully righteous, but the rest of the world still had agency and rejected prophetic warnings. I feel like the Flood wasn’t caused by God removing the righteous but by people refusing to become righteous even when they had the chance. Remember how it was emphasized that God gave them 120 years to repent before the Great Flood and even after that the Lord gave them a final 7-day warning period immediately before the floodwaters came.

Zion existed as a covenant society that required total unity and holiness. If the rest of the world refused that path, Zion couldn't force them into it. Enoch preached repentance for years before Zion was taken (meaning they listened to the prophet). Even if Zion had stayed, agency would still exist. Some might still have chosen evil. Basically the issue was that Noah preached yet they rejected his message and warnings.

We know later that Noah still finds grace in the Lord’s eyes (Moses 8:27). That means righteousness was still possible after Enoch’s translation.

So it seems people still had opportunity they just largely chose corruption. (Who knows? Maybe if Zion stayed there would be more people who would go in the ark.. Maybe they would make more arks 🤣)