2. ZFS doesn't make much sense for high-performance laptops. Laptop drives
are slow enough without artificially increasing the number of seeks on
writes. Apple makes a LOT of money from laptops. It's also unclear how well
ZFS would play with other latency- and CPU-sensitive applications
And the posts related to leopard handed out at wwdc 07 seems to
indicate that zfs is not yet fully implemented, which might be the
real reason that zfs isn't the default fs.
I suspect there are two other strong reasons why it's not the default.
1. ZFS is a new and immature file system. HFS+ has
