I agree that the post head is melodramatic. But I think perhaps you missed something in the article. As it pointed out, the kind of "easy guesses" you mention are far less likely to occur in broad fields, even if they are more likely in narrower fields. Besides, so long as the default "fail" state in a double-blind review is at least _no worse than_ the current "succeed" state of single-blind, I don't see why there would be an objection.

I confess that I've done a reasonable amount of graduate work, and I work at a well-known college (staff, not faculty), and I was genuinely surprised to learn that most reviews aren't double-blind. It seems to me to make more sense as the default option.

But again, I don't disagree that the submitter is hyping the situation with that head. The situation isn't necessarily "corrupt" -- but I can understand the inclination to interpret it that way.