Imagine finishing some game and not ever wanting to return to its SP, but you want to play MP for a very long time. At the same time you're aware of your HDD space. Why not give you an option to free up several or dozen of GBs if you won't play the SP anymore?
An option to not install the SP would make sense for some of COD and BF players but might be too drastic...
What do you think?
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