Wouldn't most of the 'complete dumb idiot' questions have been asked already, though? By this point, I reckon you're at the stage where a lot of info may be... specialist, shall we say? So, you've got the situation where however experienced people are in general, there's something about the specific situation that their experiences may not cover. The best Mage might know stuff all about... to be on-topic, disease prevention?
The problem is, every edition as writers and publishers we have to think about new players. While we use and pull from older source material, we can't really expect every player to be familiar with them. So when you're referencing something from an older edition like, say, Bug City, or Dunklezahn's assassination, or the Nightwraith Incident, the Nanosecond Buyout, Deus, Year of the Comet, the Artifact Rush, Super Tuesday, Sam Verner, the Mana Storms in Australia, Yomi Island in Japan, Kid Stealth's custom cyberlegs, Argent, Jack Skater, Hatchetman, Cyberzombies, the Night of Rage, UGE, Goblinization, decking naked with program carriers, Boosted Reflexes, FAB...
You get the idea. There's a crapton of data out there. We have a couple HUNDRED sourcebooks at this point. Even if every book and every novel was available in PDF (WHich they aren't for one reason or another), that's a couple thousand dollars to purchase them all, and god only knows how long reading them. We can't expect every player and GM to know all of this information.
So when you're talking about something that's ancient history, but is relevant to the current discussion, you can assume that all of the runners on Jackpoint would know this stuff. That's where a newbie comes in. Because they can ask a stupid "Who's Deus" type of question, and not lose credibility the way Kane or Bull would. And then that gives us, as writers, an excuse to summarize Deus and the Renraku Arc shutdown while maintaining some kind of fictional structural integrity.