> Essentially all of Apple's products are single disk. There is virtually no win there.
You can have multiple copies even inside a single disk. And this is useful when you use cheap disks.
> The checksumming is a nice feature and desperately needed as disk capacity continues to explode but bit errors remain the same, but in practice probably the biggest risk is bugs in FS code:
This is not true. At some point, a heavily used disk will start failing. It is really nice to be protected against that - and very important to know when it starts happening.
I talk from experience - I had a zpool scrub detect silent file corruption once. Curiously, it never happened again with that disk. But I keep using that disk (of course, with frequent backups) - and I would never do that (continue using a disk that failed) with any other Filesystem.
You can have multiple copies even inside a single disk. And this is useful when you use cheap disks.
> The checksumming is a nice feature and desperately needed as disk capacity continues to explode but bit errors remain the same, but in practice probably the biggest risk is bugs in FS code:
This is not true. At some point, a heavily used disk will start failing. It is really nice to be protected against that - and very important to know when it starts happening.
I talk from experience - I had a zpool scrub detect silent file corruption once. Curiously, it never happened again with that disk. But I keep using that disk (of course, with frequent backups) - and I would never do that (continue using a disk that failed) with any other Filesystem.