Why do video game console discs now require installation, when we could just put them in and play instantly before? Why did PC discs always require installation

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Answer 1

Reading from an SSD is much faster than from disc. It also has to unpack textures and other features required to run the game. Things that would not fit on a single 50GB blu-ray. Many games are now 100GB+. Gone are the days when the game was essentially installed on the disc and read.