[tjoff]

This is a tangent but you seem to be under the impression that filesystems grow on trees. I've been waiting for a modern COW linux filesystem for almost a decade now. Maybe in a few years it's mature enough to wait a few more years for it to become stable? (I'm looking at you BTRFS) ;)

I guess BTRFS would fall into the filesystems that do everything category... Though at the other side of the spectrum you have filesystems that have not been tested enough or isn't maintained.