StarCraft and it's expansion is a must for GOG preservation, the game while can be difficult is extremely rewarding to play and fascinating writing of it's universe, story and characters. Solid voice acting and impressive cutscenes for the time. This game was Blizzard at their greatest.
There is a reason why this and Broodwar survived for so many years even during SC2's launch, it was massive in South Korea.
While Blizzard has done a faithful job updating the visuals for clarity and some minor fixes and even a fun cartoon visual. Blizzard has lost interest in the brand and left it perish.
I was smart enough to buy a physical copy of SC1+BW when my game store used to sell physical PC games that didn't require the internet alongside WC3 with Frozen Throne and Diablo 2+Expansion.
Blizzard tried to get rid of Diablo 1 and only play on their service, it became the new purpose for GOG to make game preservation. And StarCraft deserves the preservation for its impact to the gaming world and a reminder of how great Blizzard was as game developers.