Your original point was that "99.999% [of FOIA exemptions are] ass-coverage through secrecy" and that's a bad thing. I disagree for the reasons I specified.
If stupidity were cause for dismissal, we'd have a hard time staffing most of the jobs in the world.
Was that ever a standard for exemption from FOIA? Much less the intent of anyone writing any part of FOIA? Stupidity should hurt.