In any case, I'm not arguing that it's impossible, but rather that the more comprehensive the archive, the less welcoming the community would tend to be, all other things being equal. To take it to the extreme, I'll posit the following law: "A well-curated archive is the grave of a community"
You can still have channels open to welcoming new people while at the same time having a large archive of answered questions so that over time a reservoir gets built.
Saying that the same questions getting asked over and over again by new people is somehow a more welcoming community, is like saying that there's any meaningful interaction happening when two people say "What's up?" followed by the response "not much". It's a handshake protocol equivalent without actual depth.
I see friends shaking hands
Saying, "How do you do?"
They're really saying
I love you.* FFS, read the fuckin' archive noob and stop wasting our time
* Hey there, thanks for asking! This is actually a pretty common question, and we have guides written up for just this case. Try entering some of your search terms here [link], and come back with a follow-up question if that doesn't help you!
But yes, in fairness, I'll certainly agree that a community which _chooses_ to respond as the former will stagnate and die.