Phoronix always test the default settings of each OS/distro. Guess what would happen if this wa not the case. Others would complain that you should enable this and not that and others the oppossite. So the default settings is the best option since that's what the users have when they install the system. Most of them afterall stay with the default settings for ever.
FreeBSD's UFS is well known for it's speed with soft updates enabled. It should have been enabled. Using FreeBSD's UFS without soft updates is like using ext4 with extents turned off. I would even be so bold as to say that Debian's installer is broken if the default is to have soft updates disabled. BTW, I have been running a Debian GNU/kFreeBSD server since Lenny was still in testing.
So the default options, maybe is not the best options around, but is something objective and at least it satisfies the default user.
At least there is phoronix global around, to test our tweaked systems.
We can go further and say Linux kernel was using non optimal config, file system, file system mount options etc. Linux kernel used here was also quite old.