I remember when I found out the identity of the Clairvoyant. As an active writer on the wiki, I want to be sure the world knew that I knew. Then I thought about someone: the reader.
The first time reader of this wiki might not want to have the whole season spoiled by one sentence. That person may want to savor the taste of the information instead of having it crammed down his throat.
When the Clairvoyant was discovered to be John Garrett, everybody (I use the term loosely) wanted to change every word in every article to Garrett that once read the Clairvoyant. Raina was recruited by the Clairvoyant, scratch that, John Garrett. Edison Po was killed by the Clairvoyant, forget that, John Garrett.
Meanwhile, the new reader was told, if you didn't want spoilers, you shouldn't have come. Crammed. Down. His. Throat.
Now we know the real name of The Doctor, Skye's Father. There was a writing frenzy that night. Everybody (loosely speaking, of course) wanted to change every name from Skye's Father to Calvin Zabo on every article. There was no such thing as redirects or other tricks. There was only Zabo, Cal, Calvin, Calvin Zabo.
Do I need to mention Daisy?
Well, days have passed and the dust has settled.
There is a person out there who has just watched Guardians of the Galaxy for the first time and is now on love with the MCU. This person has just realized that Agents of S.H.I.E.L.D. is part of that "universe" and just watched the show. S/he has just watched an old episode and felt lost so s/he went to the internet and found this Wiki.
Let's cram the information one more time...