Earlier quoted context omitted.
"Server can't be reached" gives critical, actionable information. Error messages can be searched for! If you can't search for an error message, you can't use a computer.
Or you can't search for it because you can't reach the internet. Anyway, if you can definitively figure out which of the following is true from that message without the use of additional diagnostic utilities, well... (yes I have personally seen all of these (except exactly 12 which I've seen variants of but worded it the same way as the article)) 1. Your cable modem can't find a signal, because of weather conditions…
I appreciate your point regarding the multitude of possibilities for a server error, but remember what we're talking about. The user did not even attempt to read the error message, did not know what it said, and kept retrying thinking things would change. He didn't take some next step to try to diagnose potential connection problems (e.g. check for ethernet cable), he just threw his hands in the air, said it doesn't work, and ran to IT. He can't use computers.