Worth noting is most of the game is the assets. Roughly 70% if I were to hazard a guess, with maps being most of the leftovers
#Mounting Games + Uninstalling them
cold ice
potent wyvern
storage is cheap, you have the option of just not using content that uses CS:GO though, ive rarely even seen addons that rely on CS:GO as opposed to CSS
As the person above said - pretty much all of CSGO is exactly that, it doesnt have a campaign and it doesnt have lots of voicelines