I am no NFS expert, which makes my review very superficial. The document itself was good read and did not spot anything controversial.

The only complaint I have is on the editorial side. There are a number of abbreviations that are never expanded or referenced where they originate from. The reader is just assumed to be familiar with RFC5666, 4506, etc. I would either expand everything (take ULP and XDR as an example) or have a section/sentence pointing out that this document uses the terminology established in RFCs x, y and z.