Most games have similarly long development cycles for one
Another is graphics in many ways can scale
Textures can be replaced for example. So you can have a mediocre texture on a gun for 4 years of development then have a good one for the final year. This is why so many old games can have “texture packs” and look like new games. Look at Skyrim unmodded vs Skyrim with a texture pack.
Hell even Minecraft can look way different. All anyone did was change the block images.
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