I think you're putting a lot of emotion into one ill-advised comment Monte made. I prefer to look back on all the awesome and brilliant stuff he's written. Monte's proved himself many times over.
It was an entire article. And it wasn't the only example. He proved time and again he had never really played 4E, or made any effort to understand how 4E worked, and that alone made him entirely unsuited to create an RPG that 'united every edition.'
I mean as a 3.X player, how would you feel if someone wrote an article about a nifty mechanic where wizards, instead of getting encounter powers, got a whole lot of daily powers from lists of possible daily powers, and suggested maybe as wizards gained levels they could get those dailies from higher power lists, as well as getting more from the low power lists?
Because that's how painful reading Cook's articles were.
I mean lets put that in perspective. Monte Cook is taken aboard to help design 5E. He gets a new column, Legends and Lore. He devotes his very first article to introducing his idea for a brand new gameplay mechanic. A brand new gameplay mechanic that 4E has used for the ENTIRE HISTORY OF 4E. He presents this as a new innovation that 5E might use. That was his grand introduction to the community.
Oh yeah, his second article was about making magical items optional, something the Dark Sun campaign setting and DMG 2 had done YEARS ago. He presented this as something new to the history of D&D.
His third was about removing the 'every PC is an island' model of 3E and replacing it with a model where other players had core abilities designed to help the party as a whole.
I kept waiting for the "surprise! Each one of these is an actually already in 4E" article, but it never came. I think he thought he was discussing something BRAND NEW. Frankly his name was dog dirt to most serious 4E players, and not for 'no reason,' or because he created 3E. He was given a forum to present his ideas, and each one of his ideas demonstrated that he'd NEVER EVEN PLAYED A 4E CAMPAIGN.
One would think at least playing a 4E campaign would be a prerequisite for the man who was supposed to lead the design of the 'edition to unite all editions.' But from reading his articles, you got the distinct impression he meant 'unite AD&D players with 3E players.' Hysterically, by developing bad versions of a lot of the mechanics 4E used.