Honestly, no one would even care if there were the greatest intel of all time, the most incriminating information, published on a free-for-all wiki without any editorializing. This is the model Wikileaks had at the beginning - and no one cared and things didn't change.
Many reasons, just the most important one: No media organization is going to cover your whistleblowing (and researching and verifying and spending hundreds of manhours before publishing it) if they cannot be sure they have an exclusive. If there is a slight chance they'll get beat to it, they won't touch it (with serious effort).
So: Either you editorialize and embargo stuff and work together with media organizations. Or you don't - and no whistleblower will ever give you stuff anymore, because it's just not going to change anything.
Actually, IMHO, Wikileaks has an obligation to whisteblowers to get the most bang for the buck and that's just not going to happen in the old ways.
There's a reason no one in the real world knows what cryptome even is.