People are always puzzled by why reports take so long to produce.. In this case we know that the pilots while probably involved with check-lists at night failed to remember that the intersection at that point was poorly marked but speculation doesn't work. In any accident investigation even those that the cause might seem blindingly obvious factors from all aspects have to be considered and discounted.. It's proving that all the other factors of the flight played no part that takes the time... they can't just stop at.."OK lads looks like the crew failed to notice the intersection, that'll do"..They have to know that the nose wheel steering hasn't failed, that no distractions were occurring that caused the crew to miss the intersection, that the radios were not a factor. etc, etc..It's proving what didn't occur that takes the time in every investigation.. and we wouldn't want it any other way would we ?