The reason is probably -
Giving someone blanket advice that is only partially helpful is not good...
So he waits a week, and has done no research into what may have caused this, what then? Panic?
I would fully agree that panicing is the wrong idea, but so is sitting around doing nothing, as an agency - it is very easy for a person to say - just wait it out, but as a consumer what does that mean - sit around and do nothing, or proactivlely begin researching the possible causes?
So I would think a more correct answer IMHO to someone who is new to the game, would be...
Don't panic, but don't be complacent - Begin researching your tactics over the past years, your link profile your on page seo ect.. so in a few weeks IF it does not "Magically" clear itseld you can have a clear actionable plan to begin responding - two weeks of no money coming in could mean death for a business.... So why would you not begin researching while "wating"
I also do not think the "dust" will settle, this is an ongoing battle, and will be for some time to come - so waiting a few weeks on a site that = livelyhood is not a smart decision either
IMHO of course