system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why do Xbox One/PS4 games need to be installed to the hard drive, but every console before this generation you could just put in a game and play.
gpt
Game sizes (and therefore texture sizes) have increased.  Larger files take longer to load.  Especially if you're playing an open world game where parts of the map are constantly loading in.  The disc drive could never keep up.