IO has a tangential benefit as well when it comes to recovery. For some large disk drive raids (1tb+) the rebuild time has gotten so large that even with an available hot spare you have a considerable exposure window during a rebuild. I believe this is what helped drive the push of RAID 6 over RAID5. In theory you still had 1 disk of protection during a rebuild. Although SSD's are primarily champions ins random IO and not the linear read/write of a rebuild they still have the potential to reduce this window of risk.
This is the main conclusion at the end of the article: that SSDs should be picked for their performance rather than for their reliability, as SSD reliability hasn't been proven to be better whereas performance has. Reliability comes in here because you can replace 4+ HDDs with a single SSD and thus reduce energy/heating costs and also increase reliability as you only have 1 drive that can fail vs 4+.
You should also consider the reliability of a drive decreases at the same rate the data it holds gets more important. The more important the data, the less you should trust your disks (and do better backups, better mirroring, better checksumming...
