I think the issue is that they have now changed this risk classification of a number of systems and now have to think of stuff like "well, if the variable tag g

I think the issue is that they have now changed this risk classification of a number of systems and now have to think of stuff like "well, if the variable tag gets bit flipped, what should happen?" Its not really a sign that they are finding things that were uncertifiable before, its that they are uncertifiable post-grounding. I would honestly expect more of this to happen throughout the industry, since the FAA doesn't want to be blamed for anything, they are going to expect lots more to be spent on making even safer aircraft.