When and why to deprecate filesystems

It's not what others think. It's what I think.

Suppose I find an intractable ext4 bug, no biggie I ask Theodore Ts’o. A problem with reiserfs, well, I can conceivably ask Mr. Reiser sometime next year, but I kindof doubt he's even been able to look at that code during the time he was imprisoned.

Also, the world has moved on, give me a reason why anybody would want to start using reiserfs today, instead of btrfs or ext4 or xfs or …