Robert Zak of DualShockers Writes “Ive played many of Larians games over the years, but I can only say that I became a full Larianite with the Original Sin series, which properly integrated co-op play into their campaigns. I played through both in their entirety in split-screen with my partner, and can legitimately say at this point that they made the pandemic bearable. I still remember how the first game let you play rock-paper-scissors with your partner (skewed towards whoever had better Persuasion) to decide whose dialogue decision won out in a given situation, while Original Sin 2 would go so far as to let players screw each other in their bids to become the Divine.”
Source: N4G PC Split-Screen In Baldur's Gate 3 Needs Some Serious Spit-And-Polish