If anyone is familiar with the ATF and their ever changing interpretations of their own damn rules, you'll understand that this is a big win. They will, seemingly on a whim, pass conflicting statements on gun parts that they previously approved without issue, and sometimes (as seen) reverse those opinions and interpretations again, later.

At least we don't have to worry about getting in trouble for shouldering a pistol brace anymore. I remember having to hold it away from me or cheek weld it anytime the range had some fudds there.