Forum Discussion
I might be wrong, but I think "new save" means a new game. Imagine they add a change to one of the premade lots that is in the game when we run it for the first time, or they make changes to premade sims. Then it would cause chaos if such changes was added to existing games, because simmers might have adjusted both sims and lots long ago. So, the changes will only have affect in new saves (new games). "Save as..." would not get such changes.
I've been playing the same save, essentially, for 6 years. I "save as" and make fresh backups from time to time, and after updates. I have an empty world save I go back to if I feel like moving things around. But I haven't started a fully new, back to the base, game in all that time. The only issue I've encountered is that I occasionally have to look up what was originally on a lot so I know where to go if that matters. I had to go to what is the Aspir lot in my game when we were supposed to go to the park. Worked fine. As far as I can tell, my game is fully updated. That's not to say they might not update something that truly needs a new game, I just haven't had it happen yet.