Game's size depends on many factors. Besides devs' laziness or the abundance of inique assets and dupes, I had a fun ride with Vermintide 2 whose devs were able to cut game's size from 100gb+ to 60gb+ at once because they added all incrimental updates as additional archives and also prefered to have all assets for one level in one place even if they are shared, so it grew out of proportion over the years before they decided to cause a complete asset restructurement and dublicate hunt before the major update. It made players redownload big chunks of the game but resulted in a way less terrifying size to those players they wanted to start it or return into.