I've seen some discussion on HN in which people claimed that even really important engineers aren't -too- important and that Ilya is actually replaceable, using Apple's growth after Woz' departure as an example. But I don't think that's the best situation to compare this to. I think a much better one is John Carmack firing Romero from id Software after the release of Quake.<p>Some background: During a period of about 10 years, Carmack kept making massive graphics advances by pushing cutting-edge technology to the limit in ways nobody else had figured out, starting with smooth horizontal scrolling in Commander Keen, through Doom's pseudo-3D, through Quake's full 3D, to advances in the Quake sequels, Doom 3, etc. It's really no exaggeration to say that every new id game engine from 1991 to 1996 created a new gaming genre, and the engines after that pushed forward the state of the art. I don't think anybody who knows this history could argue that John Carmack was replaceable.<p>At the time, the rest of id knew this, which gave Carmack a lot of clout and eventually allowed him to fire co-founder John Romero. Romero was considered the kinda flamboyant, and omnipresent, public face of id -- he regularly went to cons, worked the press, played deathmatch tournaments, and so on (to be clear, he was a really talented level designer and programmer, among other things, I only want to point out that he was synonymous with id in the public eye). And what happened after the firing? Romero was given a ton of money and absurd publicity for new games ... and a few years later, it all went up in smoke and his new company folded, as he didn't end up making anything nearly as big as Doom or Quake. Meanwhile, id under Carmack kept cranking out hit after hit for years, essentially shrugging off Romero's firing like nothing happened.<p>The moral of the story to me is that, when your revenue massively grows for every bit of extra performance you extract from bleeding-edge technology, engineer expertise REALLY matters. In the '90s, every minor improvement in PC graphics quality translated to a giant bump in sales, and the same is true of LLM output quality today. So, just like Carmack ultimately turned out to be the absolute key driver behind id's growth, I think there's a pretty good chance it's going to turn out that Ilya plays the same role at OpenAI.