The golden age isometric RPGs (BG1 & 2, NN, Fallout, etc) were dubbed Computer RPGs, because the idea of translating a pen & paper roleplaying game to the computer was novel. But as the 2000’s marched forward and 3D graphics became an expectation - and video game budgets ballooned - simulation and writing took a backseat to visual spectacle, action gameplay, and set-pieces. Niche CRPGs became too expensive to be worth the risk, leading to KOTOR, Fallout 3, Mass Effect, etc; which would have more mass appeal.
As Larian has been showing, the ability to pack all that story and character moments, and present it with a cinematic look and feel is becoming increasingly possible (with years of hard work). Larian and Obisidian have been whetting everyone’s appetites for the CRPG format, and now BG3 seems to be reaping the rewards.