Thread:BEJT/@comment-24669364-20190702212933/@comment-26838855-20190702235128

That was established before I joined this wiki. I believe the idea was that no year justified its own whole page until 2010 (that was also at a time that Iron Man was placed in 2010 on this wiki), so it made sense to make decade pages up to 2000s, then 2010 onward would be individual years. Then that just stuck as the system.