Then why EBS failure rate is several orders of magnitude higher than in SAN deployments? A SAN provider would be quickly out of business with 0.1-0.5% annual failure rate.
Just because it's a SAN doesn't mean a given abstract block device from it is backed by RAID. It's literally just a multiplexed and QoSed network-attached storage cluster.
I actually prefer the lower-level abstraction: if you want a lower failure rate (or higher speed), you can RAID together attached EBS volumes yourself on the client side and work with the resultant logical volume.
SAN reliability ratings start at 99.999%.