The question we should be pushing is if you already have an nfa item, why should there be any wait? You have already provided fingerprint, photo, etc. The atf knows where you are and what you own, so if you become a prohibited person, I assume they will come get your nfa item. Just like how my ccw works. You get approved and it’s good for 5 years or until revoked.
so they could 1) want the process to be so complicated no one uses it. Slowing ownership of nfa items or 2) have no method of following up on people who become prohibited persons, or 3) have no desire to actually fix the system, or 4) are incompetent and don’t even know it’s an issue, or some combination of above issues.