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In all of those cases you are now locking away the new features to only be discovered at the ends of the galaxy or after beating the main game and learning about the multiverse. The galactic core would remain entirely unchanged. So everyone new playing would be stuck on v1.0 for hours until they get far enough away from EVERYONE while everyone else is drifting about in v10.4.
Look at Minecraft: if you keep your old world, you have to travel to places that have never been generated yet to see new chunks formed. Eventually you have a massive world where the center is old and buggy and then further out you go suddenly features are available. It’s the reason why most people don’t keep legacy maps running for years, and when they do, there’s massive train/teleport systems in place to get you the fuck out of the og spawn.
Or Singapore and chewing gum.