Unlike Sam, these guys can dive deep into whatever industry they choose with a very obvious clarity of thought. Watch any of their interviews for examples. Even though Steve Jobs wasn't "technical" he was able to speak about the technical aspects in detail. On the other hand, Sam seems to stand at a very high, superficial level. I have yet to see him dive deep into any of the frontiers he's focused upon: AI, energy, biotech, etc.
But it's not just that, these visionaries let their track record speak for itself. I don't seem to understand Sam's track record. A Stanford dropout whose claim to fame is selling Loopt for $43M (at a loss to investors) after raising $30M in total at a $175M valuation, and pocketing $5M for himself? Then goes on to tout YC's runaway success as due, in part, to his leadership when >60% of YC's portfolio value is due to ~15 companies from pre-2014 YC batches.
To top it off, as proof of his ambition, a silly comparison between YC's portfolio value being 14% of Alphabet's market cap is made. That's apples-to-oranges.
Bottom line, the results we see today are largely due to PG & friends. I wish people would stop forcing this narrative of Sam Altman as a visionary. Right now, he's more Tim Cook, less Steve Jobs. There's nothing wrong with being an operational genius. YC, the company, has a manifest destiny.