My concern, reading the reported tale, is that one might wonder whether the coroner might have done better insisting that he actually did have such expertise available to him during the coronial ? His reported comments suggest otherwise ... ?
The list of witnesses at para 17 seems to include some people with considerable aviation expertise, though it might be argued some of them had at least apparent conflicts of interest. I think 43" makes a good point: The statements in the ATSB report naturally raised issues and questions beyond just pilot error but the coroner had no witnesses independent of the operator to give evidence on those issues to help answer those questions. And, for all the coroner knew, the author/s of the ATSB report could have been the Year 10 work experience kid/s. The operator naturally argued that there was no credible evidence before the coroner to support findings equivalent to some made in the ATSB report.
The ATSB's usual practice of refusing to get involved in coronials has its disadvantages...