xnr:
I think I know a bit of the background to this problem as I used to work in TC Aircraft Certification and discussed this a lot with the ops people, and the heliport design folks.
The issue was safe operation in and out of some heliports that weren't ideal. The solution was to either require Cat A, or demonstrated performance to get you into or out of the heliport if an engine failed.
This was the first time that TC had required Cat A in any operations, so I'm not surprised that there were some questions and comments.
But it was done with a lot of discussion and consideration. Any other problems, you can contact me off-line if you want.