This exactly and that last word exactly too. It's as if they're not looking to assign a rating, but looking for any tiny reason to not assign one.
Cambridge Shore with the Mayfield tornado had swept-away homes properly anchor-bolted with many instances of wall plates being gone, which would imply that they were well-attached to the studs, but one group of those homes were lumped together and described as something like "not well constructed with end-nailed studs". And with Hackleburg there was the one "exceptionally well-built home" swept away. I'm given to understand it had extra strapping done in the wall and roof structure and extra anchor-bolting because it was custom-built as a new home after the owners previous home elsewhere was destroyed in a tornado and they didn't want that to happen again. And the poured-concrete walk-out basement wall of the house on the corner hill which was blown away, apparently without impact damage, adjacent to asphalt removal and severe ground scouring.
If you look long enough and hard enough, you can always find a reason to not do something, and if nobody has the authority to scrutinize your decisions there's a natural human tendency to allow personal beliefs and biases to enter into your decisions. EF-5's are now once-in-a-lifetime events if even that frequent, and will only be given where the destruction is so overwhelming that nobody would believe anything less.
Phil