alt Hacker NewsIt's not a case of forgotten data, it's duplicated for access time reasons, like with optical media.
It follows in the footsteps of trading in storage for less compute and/or better performance.
An opposite approach in the form of a mod for Monster Hunter: Wilds recently made it possible [0] for end-users to decompress all the game textures ahead of time. This was beneficial there, because GPU decompression was causing stalls, and the trading in of compute for less storage resulted in significantly worse performance.