Howdy Leadsled,
Only 22% percent of RNAV rated pilots responded to the ATSB survey.
Because of the low response rate I wouldn't put any emphasis on the results and neither should have ATSB.
There are some very good points that should be encompassed by AsA and CASA into the design and presentation of RNAV approaches but the original design philosphy is sound and SAFE, when the pilot(s) conduct the approach according to the rules and their training and their experience.