I'd still argue that this recommendation was aimed at the general populace that is notoriously bad at creating sufficiently secure passwords and passphrases. And I think there's enough evidence for that 
sure, I understand that.but we are abstracting here from the fact that if the "general populace" is bad at creating sufficiently secure passwords, then it is quite likely also bad at securing the copies of their wallet's secret files.
so if they were consistent in heir recommendations, they should basically recommend everyone to stay away form bitcoin. but they don't - they only recommend to not use brain wallets, like it was the very thing that is going to save an idiot from loosing his coins.
The most common recommendation nowadays is to just get a hardware wallet. Which in my opinion offer an excellent combination of security and usability. They are fairly idiot-safe, so to speak
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But WTF does it mean "brute force attacks using English grammar"? It is a meaningless term. There is no such thing!
But WTF does it mean "brute force attacks using English grammar"? It is a meaningless term. There is no such thing!
I guess Spendulus refers to using machine learning and / or neural networks trained on English syntax and semantics for creating lists of phrases that are more likely to be used for a brain wallet than others. Seems unviable without a sufficiently large set of existing passphrases to train the network on though.