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Either saving on media costs (25GB disc instead of 100GB disc, maybe 1 disc instead of 2 if the game is too big), or even having more time to work on the game.
Developer makes sure the early stages are properly tested, send the disc for manufacturing including only those, use the manufacturing time to tweak/bugfix/optimize more stuff the rest of the game.
Either saving on media costs (25GB disc instead of 100GB disc, maybe 1 disc instead of 2 if the game is too big), or even having more time to work on the game.
Developer makes sure the early stages are properly tested, send the disc for manufacturing including only those, use the manufacturing time to tweak/bugfix/optimize more stuff the rest of the game.