the designation "C" RPG was literally instituted after the release of BG2 to differentiate it from the gold box and "J" RPG coming across consoles from Japan.
BG2 literally established the CRPG genre, and it's fundamentals were carried forward in practically EVERY story based RPG that followed it.
Bioware's RTwP system is the precursor to the weapon wheel, which is one of the MOST immersive additions to action RPG and FPS games in history. They evolved their RTwP system for DA:O and Mass Effect.
Literally fundamentally ground breaking game design that feulled the entire genre's development for the next two decades.
In my opinion, NONE of Larian's products has ever had this kind of impact.
It is far too early to say something like that. cRPGs in general have been out of the way since BG2’s success, due to many studios outright failing to capitalize on its success. I think the only game directly inspired by BG2 that enjoyed mainstream appeal was Dragon Age Origins, and they quickly swerved right off the road immediately afterwards.
DOS2 turned a lot of heads. When it released, I thought it’d end up being a new turning point for the future of tactical turn based games. But I also knew it would take some time before we would see the results of that.
And a sign finally showed up last week. Have you heard of the recently announced Switch game that’s currently called Project Triangle Strategy? It’s being made by Square Enix and modeled after Matsuno’s Final Fantasy Tactics/Tactics Ogre games, and one of its main gameplay features is quite literally DOS2’s field effects. And it being a Square Enix game, I wouldn’t be surprised if some overzealous fans started claiming that Triangle Strategy invented the concept...
(I love Matsuno’s games, his writing is on a whole other level from the rest of the jRPG devs, though sadly he’s not on the project. Although I’m pretty convinced he is working on an unannounced Tactics game too. FFXVI is being written by people that are essentially his disciples too, which is why I have far higher hopes for that game compared to the convoluted forest fires that Nomura’s games tend to turn into.)