1. Engineering incompetence.

2. Mgmt pressure.

3. Engineering failure. As in legitimately attempted, but missed the mark.

Considering how this company has operated, for decades, it's fairly simple to point to Option 2 as the most likely culprit. Option 1 is possible, but unlikely, since there are a number of engineers involved. Option 3 is also possible and could still be the issue, but if we were betting, it would be option 2, because they've already proven, that's who they are.