LARC is a huge benefit in the Solaris world, where the comparison is UFS. Solaris UFS is unbelievably primitive, and the reason why job 1 in many SOlaris shops is to buy a third-party filesytem for any serious work.
In the Linux world, where aggressive use of caching has been standard for over a decade it compares a lot less favourably.
That said, btrfs management is a shit sandwich. ZFS's management tools actually let you, you know, use the advertised features of the filesystem.