Sometime back in the 1990s, some idiot somewhere decided that games should stop being fun, and become more like work. That is, having paid (at that time) £40+ for a shiny new game, you were only allowed to play a tiny fraction of it until the developers felt you'd "earned" the right to "unlock" bits of it that for no good reason you weren't allowed to access from the off.

(Never mind that you'd already "earned" that right by GOING OUT AND DOING A REAL JOB TO MAKE THE MONEY YOU BOUGHT THE BASTARD THING WITH IN THE FIRST PLACE.)
Fortunately, somewhere around 2001 everyone got completely sick of the idea of being made to plough through hours of gruelling, joyless slog in order to be allowed to enjoy the games they'd bought, all those developers were happily beaten to death with jagged rocks, and the ugly blight of "unlocking" was banished forever amid scenes of great celebration across the land.
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