Not sure this article is correct. Your talking about nfs and sas datasets. But then blast nfs for the work directories so you are covering 2 very different topics.

1 nfs.. basically dont use nfs from a server .. using nfs from say isilon is preferred especially with its massive infiband and 8x10gbe trunks.

2
Work directories.. should always be local to the machine and on fastest drives possible. Whether lun on fiber with flash IO local or local mix of flash and 0plus1 raid or just raid0. etc..