The did not accept the panel(s) based on the UL listing the HAI carried vs. the specific listings cited on Elk's engineering documentation. Remember, these are the same sorts of people that want an individual sound per type of alarm on these panels, including SILENT on burg, with the AHJ stating that "none" was considered a sound to him, and battling the speech annunciation, temporal codes and the whole deal.
Keep in mind, I'm working with the big boys on these installs and integrating these panels with AMX and Crestron via the serials and using their interfaces combined with the Elk's (or HAI's) and massive prints in hand prior and during installation of these panels/rough ins.
Since the ELK and the HAI have the same UL Listings (except for Home Health Care) exactly what UL Listing does the HAI not have you have never answered that question? Using words like "sort of people" and Big Boys" etc. does not mean anything. AMX and Crestron intergration has NOTHING to do with UL Listings of either panel. Not going to throw my resume around but I have significant experience with these issues and so far you have not shown anything to prove a UL problem with the HAI panel.
Now if you are saying that an HAI panel does not have every feature of an ELK that has NOTHING to do with UL Listings just different feature sets between the panels that the AHJ's prefer or require one over the other in that locality (their perogative as AHJ's). Again NOT a UL issue.