Being old, I've no need to sign up for Obamacare, so I've no personal experience with the website. From what I've read, however, apparently the "navigators" who are helping people sign up are using the same software/website as those who are signing up on their own. If so, that seems wise to me. It's hard enough to keep one set of software operational and supporting the program. It would be much harder to keep two sets up-to-date: one set for the public and one set for the government employees. It would be particularly challenging when you have legislation passed late which requires changes to implement.
I don't know how MIDAS is set up, but I hope they've followed the same approach.